Jython bundled inside AppStore package hanging on forkAndExec() - Java 21.0.5 #373

We have a Java Mac package that includes Jython. Recently, using AppStore version, it's started hanging on forkAndExec() when we get the PI to run a script. Using CMD-/ spits out this trace.

Using a normal (non AppStore) build it's fine.

I'm wondering what help / pointers you can offer to help me resolve? JY version is 2.7

"main" #1 [12803] prio=5 os_prio=31 cpu=949.00ms elapsed=52.24s tid=0x00007fe745016400 nid=12803 runnable [0x000070000eba0000]
java.lang.Thread.State: RUNNABLE
at java.lang.ProcessImpl.forkAndExec(java.base@21.0.5/Native Method)
at java.lang.ProcessImpl.(java.base@21.0.5/Unknown Source)
at java.lang.ProcessImpl.start(java.base@21.0.5/Unknown Source)
at java.lang.ProcessBuilder.start(java.base@21.0.5/Unknown Source)
at java.lang.ProcessBuilder.start(java.base@21.0.5/Unknown Source)
at org.python.core.PrePy.getCommandResult(PrePy.java:469)
at org.python.core.PySystemState.getConsoleEncoding(PySystemState.java:1019)
at org.python.core.PySystemState.initRegistry(PySystemState.java:981)
at org.python.core.PySystemState.doInitialize(PySystemState.java:1201)
- locked <0x00000004b3112b78> (a java.lang.Class for org.python.core.PySystemState)
at org.python.core.PySystemState.initialize(PySystemState.java:1130)
- locked <0x00000004b3112b78> (a java.lang.Class for org.python.core.PySystemState)
at org.python.core.PySystemState.initialize(PySystemState.java:1085)
- locked <0x00000004b3112b78> (a java.lang.Class for org.python.core.PySystemState)
at org.python.core.PySystemState.initialize(PySystemState.java:1080)
- locked <0x00000004b3112b78> (a java.lang.Class for org.python.core.PySystemState)
at org.python.util.PythonInterpreter.initialize(PythonInterpreter.java:63)
at com.moneydance.apps.md.controller.Main.getPythonInterpreter(Main.java:976)