I installed 2023R1, and experience exactly the same behaviour with the new version, so it appears not to be the same issue.
Having examined the .res.err solution in CFD post, I haven't been able to identify any problems with the solution. The flow field looks, as far as I can tell, almost identical to the last successfully written out .trn file, and I have not been able to find any variables (certainly the main ones - pressure, velocity, temperature, density, turb k.e. etc.) with obvious extreme values that I would associate with a numerical issue - it all looks nicely bounded. Indeed, the flow field looks pretty much as I would expect the flow field at this point to look.
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