Fix CME in EntityVengeanceSpirit.canSpawnNew during dimension unload

[Copilot]

When a mob dies during dimension teardown, vengeanceEvent fires and canSpawnNew calls WorldHelpers.foldArea → level.getBlockState(). On ServerLevel, this triggers ServerChunkCache.runDistanceManagerUpdates on a DistanceManager whose ticket map is being concurrently modified, causing a ConcurrentModificationException.

Change

Added level1.isLoaded(blockPos1) guard in the canSpawnNew block-scan lambda. Level.isLoaded() delegates to getChunkSource().hasChunk(), which checks loaded state without forcing a chunk load. Unloaded positions skip the spirit-blocker tag check (no blocker assumed).

// Before
(input, level1, blockPos1) -> input
    && !level1.getBlockState(blockPos1).is(TAG_SPIRIT_BLOCKER)

// After
(input, level1, blockPos1) -> input
    && (!level1.isLoaded(blockPos1) || !level1.getBlockState(blockPos1).is(TAG_SPIRIT_BLOCKER))

[coveralls]

Coverage Report for CI Build 24149285071

Coverage decreased (-0.002%) to 28.5%

Details

• Coverage decreased (-0.002%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	15069
Covered Lines:	5018
Line Coverage:	33.3%
Relevant Branches:	5612
Covered Branches:	876
Branch Coverage:	15.61%
Branches in Coverage %:	Yes
Coverage Strength:	1.55 hits per line

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💛 - Coveralls