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Graph/sandbox-state-separation

Pattern

Sandbox State Separation

sandbox-state-separation

Player-facing UI and gameplay state desync or security rules fail when persistent data, server-side networking/moderation, and character components are mixed or hidden, because critical settings/hooks are applied too late or only in-memory.

Node Details

Public graph metadata

Updated7/28/2026

Connections

30 linked nodes

React context data loaded from localStorage in a Next.js app either requires disabling SSR to avoid hydration mismatches, or causes significant delayed hydration/content layout shift compared to other client components.

Pointer/mouse handlers in a React + PIXI canvas use stale Zustand state, causing dragging/editing of sequence points to behave incorrectly. The issue persists when state is modified during mouse up, and recreating handlers inside effects/updates prevents some but not all bugs (e.g., cannot drag twice).

Custom shadcn components do not update state correctly, so the form logs unexpected values

After logging out successfully, re-registering or signing in does not reset the Redux state flags `isLogouting` and `isOpeLogoutDialogue` back to `false`, leaving the UI in an incorrect loading/dialog state.

Redux state updates correctly in the UI, but inside the keyup handler (`handleKeyUp`) the component sees the old value of `playerState.isMenuUIVisible`. As a result, conditional logic (e.g., Escape handling) doesn’t run when expected.

Software actually aliasing NS and S accesses for RAMs means you can end up with two non-coherent copies of the same data in the caches — secure and non-secure data to be distinguished in caches. Tension: which can desync because of the lack of coherency. Outcome: This is why secure world page tables can be set up with NS=1 pages.

I need a way to sandbox the code and limit its permissions. — dynamically loading and executing third-party code. Outcome: there are (currently) no alternatives for running untrusted Java code within a Java application.

Storybook conditional controls that are hidden based on another arg do not update the underlying args store, leading to an invalid props/type state (TypeScript invariant break). Saving changes also fails to preserve the component prop type interface, where `undefined` values cannot be reliably serialized/merged.

Resetting the timer by lifting/resetting state in the parent causes the app/game to become unresponsive due to frequent re-renders. The Timer component also attempts to reset its local state during render, leading to problematic behavior.

Fragment state is not restored after recreation, and savedInstanceState is never reached

developers are unsure which [Sync] flags to use and when — In s&box multiplayer. Tension: Without the right flags, values either don't replicate or replicate from the wrong authority.

developers don't know how to trigger re-renders, bind CSS classes dynamically, or structure the component lifecycle — In s&box, building HUD and menu UI requires Razor components (PanelComponent), not Unity-style OnGUI or uGUI. Tension: BuildHash() is the key re-render trigger that many miss.

Submitting player stats to leaderboards and unlocking achievements requires the Sandbox.Services API. — In s&box. Tension: Developers don't know the correct call sequence — Stats must be flushed after incrementing, and achievements use string identifiers defined in the game's asset config. Outcome: typos silently fail.

Developers don't know these settings exist — In s&box multiplayer, NetworkingSettings controls important server-side behaviors. Tension: security issues (clients spawning objects they shouldn't) or performance issues (too-high update rate).

The s&box SaveSystem diffs the current scene JSON against a baseline to produce a patch. Tension: After loading a save, these values revert to defaults, causing desync between what was saved and what is restored. Outcome: health, ammo, custom networked state.

try to kick players in OnActive after they've already joined — Developers implementing server moderation in s&box. Tension: store bans in memory only (lost on restart). Outcome: The correct approach uses INetworkListener.AcceptConnection to reject at the connection stage, and LocalData for persistence.

Sandbox-style games need a "cleanup" command that resets the map to its original state. Tension: without affecting players. Outcome: resets the map to its original state.

Developers building NPCs in s&box often use monolithic Update() methods with complex state machines. — in s&box. Tension: This becomes hard to extend and debug. Outcome: A task/schedule pattern provides clean separation of NPC behaviors.

need per-player spawn limits (props, constraints, balloons, thrusters, etc.) — Sandbox games.

Common mistakes: (1) not calling RemovePlayer on disconnect causing memory leaks, (2) unbounded stack growth, (3) broadcasting undo notices to all players instead of just the owner, (4) not removing objects from undo stacks when they're picked up — Sandbox-style games need per-player undo stacks. Tension: allowing players to undo weapons out of other players' hands.

World-space camera shake (explosions, earthquakes) in s&box needs to respect distance falloff, user screenshake preferences, and use smooth noise rather than random values. Tension: Sending UI notices to specific players requires Rpc.FilterInclude. Outcome: Sending UI notices to specific players requires Rpc.FilterInclude.

developers don't know what state survives a hotload, what gets reset, and how to write hotload-safe code — In s&box, hotloading (live code reload without restarting the game) works automatically during development. Tension: Static fields survive hotloads but component state is re-initialized.

visible flicker, collapses expanded UI sections, and loses scroll positions — Dashboard with SSE-driven updates (session cards, alert panels).

severe performance issues — rendering large scrollable lists (inventory, leaderboards, server browsers) with hundreds of items using regular panel children. Tension: all panels are created and rendered even when off-screen.

WebSocket connections to external services use Sandbox.WebSocket, not System.Net.WebSockets (sandboxed out) — In s&box. Tension: Developers need WebSockets for real-time external data (chat, live scores, IoT). The same URL restrictions as Http apply — no IP addresses, HTTPS/WSS only.

Developers often struggle with: 1. Proper weapon component inheritance 2. First-person vs third-person model switching 3. Ammo management and replication 4. Weapon pickup/drop mechanics — in s&box. Outcome: requires understanding component hierarchy, viewmodel/worldmodel management, ammo systems, and inventory integration.

Understanding s&box multiplayer gamemode architecture requires knowledge of how GameManager handles player lifecycle, networking, and scene events. — The Facepunch Sandbox gamemode implements a sophisticated GameObjectSystem-based GameManager.

Implementing cleanup functionality in s&box requires removing spawned objects while preserving the map and player characters — s&box Cleanup System: Tag-Based Removal with ICleanupEvents. Tension: Filtering objects by tags (removable vs map entities). Outcome: Handling ownership for multiplayer cleanup.

naive optimistic updates either (a) flicker because the next server [REDACTED]shot wipes them or (b) get stuck because you can't — In a server-authoritative realtime app (game tick, collaborative doc). Tension: the next server [REDACTED]shot wipes them. Outcome: Switching to derive-from-[REDACTED]+[REDACTED] made the whole thing trivially correct.

Adding fields to a persisted player/document schema breaks loading of older saves — single-writer file-backed store. Outcome: every read produces a current-shape object.

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