I Installed the Raw Image Extension
I Started my TC 10.00 x64 uinder Windows 10 21H1 with the wincmd.ini file from your earlier post
I went to the folder with both the DSC06375.ARW and the sony_a7s_iii_01.arw file you have provided
I switched to Thumbnail view - thumbnails for the two images were loaded.
I switched back to Full view
I moved the two image files back and forth between directories on the same partition (c:) several times
I could not reproduce your findings. I encountered no problems.
You never answered if this helps:
petermad wrote:Have you tried to first delete your tcthumbs.db and tcthumbs.idb files and then remove *.arw from the list at "Configuration" -> "Options..." -> "Thumbnails" -> "Internal thumbnails from images:" ?