"System Thread" is buggy

Since a while some threads are marked as `System Thread` (maybe since Java 25?) in jdt debug view but the behave buggy:

1. Sometimes JDT stops on a breakpoint (jumping to editor location) but the thread does not gets selected like with "usual" threads and one has to find the thread to continue it or see the local variables.
2. Even worse, sometimes this thread vanished completely (or I'm unable to see it marked as paused) resulting in the JVM halts, but no way to continue it unless one selects the process itself and uses resume all. This even happens if the Thread was previously selected.