Quick answer: Clear all active effects and their timers in the death or respawn handler, and rebuild effect state from scratch when the player is restored.
Respawning still poisoned means death never cleared the effect list. Wipe active effects and their timers on death so the new life starts clean. Here is how.
How to fix it
1. Clear effects on death
In the death handler, remove every active status effect and cancel its timer before the respawn restores the player, so nothing carries into the new life.
2. Reset derived stats
After clearing effects, recompute the player's stats from base values so any stat modifiers the effects applied are fully undone, not just hidden.
3. Decide which effects should persist
If a few effects are meant to survive death by design, mark those explicitly and clear everything else, rather than relying on the default of keeping them all.
Catching the ones you can't reproduce
The hardest version of this to fix is the one you can't reproduce — it only happens on a player's hardware, OS, driver, or save state, under conditions that simply aren't present on your machine. A report that says “it crashed” or “it froze” gives you nothing to act on, so the bug survives release after release while quietly costing you players.
Automatic error capture closes that gap. Each failure arrives with its full stack trace, the device and OS, the build number, and a breadcrumb trail of what the player did right before it broke, so even a failure you have never seen becomes a specific, reproducible issue. Fold identical failures into one signature ranked by how many players each hits, and your worklist sorts itself worst-first instead of arriving as a stream of vague complaints.
This is where a tool like Bugnet earns its place. Its SDK captures every Unity error automatically with the full stack trace plus device, OS, memory, build, and game-state context, folds duplicates into one grouped issue with an occurrence count, and ties each to the build it first appeared on — so you fix the problem that hurts the most players first and confirm it is gone when its signature disappears from the next release.
The bug you can't reproduce isn't gone — it's just invisible until you capture it from the player's device.