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Regarding 188.8.131.52 - we needed to add JavaCast() in some parts of the code, they worked before without casting. So I am afraid that something fundamental was changed.
I was running 184.108.40.206 before and tested also the latest stable release. Cleared all caches and reproduced the issues on 2 machines.
Workarounds were javacast("byte", ...) and javacast("string", ...) in code which didn’t need casting before.