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Migrated the VM to VMware and same experience as DamienB2 - magically Git bash now runs as expected, so it does indeed appear to be a Parallels...
Forgot to mention in previous post, running bash --norc e.g. from Powershell will get it running, and it's find until you try and run a script...
I'm seeing the same issue with Windows 11, Parallels 26 and latest Git for Windows both installed by Chocolatey and its own installer. Reduced it...