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Rotation Crash on TagSubstitutionBlock #814

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Rotation Crash on TagSubstitutionBlock #814

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28 changes: 23 additions & 5 deletions src/main/java/com/ldtteam/structurize/component/CapturedBlock.java
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Original file line number Diff line number Diff line change
Expand Up @@ -67,22 +67,40 @@ public CapturedBlock(final BlockState blockState,
*/
public CapturedBlock applyRotationMirror(final RotationMirror rotationMirror, final Level level)
{
final BlockState rotatedState = rotationMirror.applyToBlockState(blockState);

// No BE data: just rotate the state.
if (serializedBE.isEmpty())
{
return new CapturedBlock(rotationMirror.applyToBlockState(blockState), serializedBE, itemStack);
return new CapturedBlock(rotatedState, serializedBE, itemStack);
}

// If the rotated state cannot host a BE, drop any BE tag (prevents renderer/loader issues).
if (!rotatedState.hasBlockEntity())
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@Raycoms Raycoms Jan 23, 2026

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Can it happen that we get serializedBE not empty but it has no block entity?

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@armele armele Jan 23, 2026

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What I saw when debugging was that for this specific decoration the block entity was reported as "present but blank" - showed up as "{}" when dumping the logs. Not sure how that comes about... but wanted to guard against it.

{
return new CapturedBlock(rotatedState, Optional.empty(), itemStack);
}

// Rotate/migrate the BE tag using the Blueprint rotation logic
final Blueprint blueprint = new Blueprint((short) 1, (short) 1, (short) 1, level.registryAccess());
blueprint.addBlockState(BlockPos.ZERO, blockState);
blueprint.addBlockState(BlockPos.ZERO, rotatedState);
blueprint.getTileEntities()[0][0][0] = serializedBE.get();
blueprint.setCachePrimaryOffset(BlockPos.ZERO);
blueprint.setRotationMirrorRelative(rotationMirror, level);

return new CapturedBlock(blueprint.getPalette()[blueprint.getPalleteSize()],
Optional.of(blueprint.getTileEntities()[0][0][0]),
itemStack);
final CompoundTag rotatedTag = blueprint.getTileEntities()[0][0][0];
Optional<CompoundTag> beTag = Optional.ofNullable(rotatedTag);

// Drop invalid/empty BE tags.
if (beTag.isEmpty() || beTag.get().isEmpty() || !beTag.get().contains("id"))
{
beTag = Optional.empty();
}

return new CapturedBlock(rotatedState, beTag, itemStack);
}


public boolean hasBlockEntity()
{
return serializedBE.isPresent() && !serializedBE.get().isEmpty();
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