TCC crashes when copying lots of file data

For a few years now, whenever I try to use TCC/LE to copy large video files, it crashes, with the window simply disappearing mid-copy.

Today, I saw a new variation: the same crash occurred when trying to copy 189 PNG files, totalling 783 MB. The first 6 files copied, a few seconds' pause, then the TCC window crashed. If I add the /U switch, I get another 6 files before another crash.

This never used to happen on my previous, Windows 7 system, but with Windows 10 Pro (clean install) it's...

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