Lightroom Classic: File rename with same name as original raw file with different file extension is not possible
It is not possible anymore to change a file name of a photo with a different extension to the same name as the original RAW file (keeping the same extension).
The Original File is called: _U6Q2537.CR2 (Canon Raw)
A second exported Tiff File in same catalog folder is called for example: _U6Q2537_copy.TIF
If you want to change the name of the exported filed back from _U6Q2537_copy.TIF to _U6Q2537.TIF then Lightroom will instantly overrule this name to _U6Q2537-2.TIF or _U6Q2537-3.TIF.
It won't accept the same name although it is a different extension (and thus still unique in it's name).
The issue is occurring when you want to change the file name in the Metadata panel under 'File Name'.
This used to be working fine lower than version 10.0.
In case you have chosen from Lightroom to edit in Photoshop and save the file coming back into Lightroom, it will also be saved with the exact same name (when you have set this in the preferences) but with different extension (TIF,PSD, etc). So it is still possible. But not when a file is already existing.
Lightroom Classic version 10.0 (Windows only); In the MacOs Version it works fine.