Annotation processing regression

[hwellmann]

The following reproducer project compiles with vscode-java 1.47.0, but not with 1.49.0 or 1.50.0

https://github.com/hwellmann/immutables-vscode

Annotation processing fails to generate the class ImmutableFoo. There is a stack trace in the language server log.

[snjeza]

This is an upstream jdt.core issue.
The related issue - eclipse-jdt/eclipse.jdt.core#4687