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Graph/state-reset-cleanup-isolation

Pattern

State Reset & Cleanup

state-reset-cleanup-isolation

Sandbox-style games fail when map reset/cleanup is implemented without isolating persistent per-player data from live character objects and spawn hierarchy, causing stale state, blocked network listeners, or broken undo/Save behavior during resets.

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Updated6/25/2026

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30 linked nodes

Zustand persist middleware does not write during the test setup

When using zustand persist, Set/Map values are stored as JSON objects/arrays, so on reload they are not restored to their original Set or Map types.

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).

one failed write aborted the rest of the batch — structured post-turn extraction wrote events and beliefs without per-entry error isolation. Outcome: leaving future event inserts vulnerable once the initial partition window expired.

your token-counting / budget-calibration state had no durable backing. Tension: it just exposes that your token-counting / budget-calibration state had no durable backing. Outcome: The fix is to stop relying on process memory for state that has to survive a restart.

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.

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.

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.

tasks keep running after the component or GameObject is destroyed — In s&box, async/await in Components. Tension: Using raw Task.Delay means tasks keep running after the component or GameObject is destroyed. Outcome: causing null reference exceptions and ghost behavior.

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.

Fall damage in s&box fires on the owning client (via IPlayerEvents.OnLand) but damage must be applied on the host. — via IPlayerEvents.OnLand. Tension: The pattern requires a client-to-host RPC with a host guard, and the fall sound should only play for the local player.

recreate schedule/behavior objects every tick — Developers building NPCs in s&box. Tension: causing allocations. Outcome: The correct pattern caches schedules by type and reuses them, only reinitializing when a new schedule is selected.

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.

SESSION_HANDOFF.md only gets written at clean session end — crash/OOM/gateway restart. Tension: not during unexpected termination.

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 object ownership in s&box multiplayer is essential for prop protection and security. — s&box multiplayer.

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.

handling player death, creating a ragdoll, and allowing the player to spectate their corpse before respawning — in s&box. Tension: Challenges include: 1. Creating a death camera that follows the ragdoll 2. Handling respawn input from the player 3. Managing the transition from living to dead to respawned states. Outcome: before respawning.

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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