[TheMeinerLP]

Root causes

1. Mode switch skips: one physical sneak + right-click can reach the jumprun item more than once (use-on-block packet, then the plain use-item packet), and each arrival cycled the mode. The hand is not the cause: the hotbar dispatches the stack of the hand that fired.
2. Runs aborted at score 0 within seconds (94 ABORT runs in a week): use() toggles, so a double click or the follow-up use packet of a click on a real lobby block stopped the run.

Fix

• Mode switch: further switch requests within 5 player ticks (250 ms) of a switch are ignored. The window runs from the switch, not from the ignored clicks.
• Start grace: a started run ignores use for 20 ticks (1 s) after its start, reusing the suppressedUntil mechanism.
• Run end clears click state: ending a run by any reason (abort, fall, death, return to spawn, leaving the instance, disconnect) removes its start grace and pending click state, so an earlier run can no longer refuse the next start within a second.
• Block clicks: the plain use packet that follows a click on a real or fake block is ignored for 2 ticks only while a run is going on. Between runs a click on a lobby block does not affect the item, so the item still starts the run or switches the mode.
• Time is the player tick counter, so Env tests drive it with env.tick().

Spec

OpenSpec change openspec/changes/jumprun-click-debounce (proposal fix(jumprun)). Its delta MODIFIES the requirements "Schwierigkeitsmodi" (every sneak click switches the mode, except within the 5-tick window after a switch) and "Laufende" (the item ends a run, except within the 20-tick start grace; block clicks during and outside a run), each with scenarios. The change is validated; its tasks are checked, and the last one is this PR.

Tests

• Mode and stop tests now go through the lobby item (useItem, sneak use) instead of the module's toggle, so they exercise the use path.
• New tests, observed red on their assertions before the fix:
  • a click on a lobby block followed by the item starts a run;
  • a click on a lobby block followed by a sneak use switches the mode;
  • a run ended by death or by returning to spawn inside the start grace does not block the next start.
• Existing test kept green: a block placement during a run does not stop it.
• F.I.R.S.T.: no sleeps or system time, a fresh fixture per test, ticks driven by fixture.tick / fixture.tickPastGrace, a fixed UUID in the leaver test.
• ./gradlew spotlessApply and ./gradlew build are green locally.

https://claude.ai/code/session_01DWzXyozSMX1ngvbMZGLvwA

[github-actions]

Test results

  447 files    447 suites   26m 21s ⏱️
3 351 tests 3 350 ✅ 1 💤 0 ❌
3 364 runs  3 363 ✅ 1 💤 0 ❌

Results for commit af01085.

♻️ This comment has been updated with latest results.