Hello there,
I see it well in the windows file explorer but I see it wrong in Screencaptor v4.36.2 also in the previous version. I updated but it didn't help, I cleared the icon cache but it didn't work either.
When I close Screencaptor I move the files from the windows explorer and reopen Screencaptor then it takes the thumbnails well, but if I take a screenshot the thumbnail does not appear in Screencaptor and if it appears in MS file explorer