I have the opposite problem to Copy text to Windows clipboard
It happend only recently that I can not directly insert/paste from a translation of DeepL into the selected text in FM. But the problem has nothing to do with DeepL. Selecting text here - in the browser - and trying to paste in FM pasts on old Clipboard contents although a clipboard inspection shows new contents in HTML, Text and Unicode text
The clipboard can be pasted without any problem to any app other than FM (in my case FM-19).
CTRL+v does not change the selection or does not insert anything.
Only CTRL+SHIFT+v (Paste Special), then Enter to paste Text changes the selection or inserts the clipboard contents.
In the previous session there were 2 hibernations with the FM file open...
After a restart of Windows 10 everything was fine again!
I have not es that the hibernation makes problems also for my ahk scripts - they require a reload after wake up. And there are other quirks in FM after wake up: CTRL-xxx shortcuts do not work. I have filed this as bug years ago - obviously this has never been fixed.