Updating dependency to 1.21.11 fails with java.lang.RuntimeException: Failed to process

Issue Description:

Hello, I am in the process of updating my mod, which uses ShulkerBoxTooltip as dependency, to 1.21.11, but when running gradlew build --refresh-dependencies with ShulkerBoxTooltip version bumped to 5.2.14+1.21.11 it fails with this error:

Could not remap shulkerboxtooltip-fabric-5.2.14+1.21.11-sources.jar fully!
java.lang.RuntimeException: Failed to process: ####\AppData\Local\Temp\fabric-loom-src9929053937082095417\com\misterpemodder\shulkerboxtooltip\impl\network\Payload.java
        at org.cadixdev.mercury.Mercury.accept(Mercury.java:268)
        at org.cadixdev.mercury.Mercury$Requestor.acceptAST(Mercury.java:291)
        at org.cadixdev.mercury.shadow.org.eclipse.jdt.core.dom.CompilationUnitResolver.resolve(CompilationUnitResolver.java:1134)
        at org.cadixdev.mercury.shadow.org.eclipse.jdt.core.dom.CompilationUnitResolver.resolve(CompilationUnitResolver.java:778)
        at org.cadixdev.mercury.shadow.org.eclipse.jdt.core.dom.CompilationUnitResolver$ECJCompilationUnitResolver.resolve(CompilationUnitResolver.java:84)
        at org.cadixdev.mercury.shadow.org.eclipse.jdt.core.dom.ASTParser.createASTs(ASTParser.java:1107)
...
Caused by: java.lang.NullPointerException

Previously I used 5.2.11+1.21.9 with my 1.21.10 version, which worked fine, but bumping it to 5.2.13+1.21.10 in my 1.21.10 branch also has the same issue as above.

Here is a branch where running the command should reproduce the issue:
https://github.com/martinkadlec0/harous-netherite-shulkers/tree/1.21.11-WIP

Thanks for any help

Affected Versions (Do not use "latest"):

• ShulkerBoxTooltip: 5.2.14+1.21.11
• Minecraft: 1.21.11
• Fabric Loader: 0.18.2
• Fabric API: 0.139.4+1.21.11
• Other mods (if relevant):