Why is text always pasted in Liberation Serif with extra spaces?

When copying and pasting values into Calc, they are always in Liberation Serif and have an additional space at the beginning and end of what I copied. The source text that I’m copying is Arial and I’m not including spaces before and after the text that I’m copying. So Calc seems to be deliberately inserting the extra spaces and also changing the entire cell’s format to Liberation Serif.

I’ve read on this forum that I can paste using Ctrl+Alt+Shift+V to paste unformatted text, but I rarely remember to use this cumbersome keyboard “shortcut”.

Is there a way to alter this behaviour so that plain text is the default? Or can I at least specify the default font for all pasted text so that it’s not Liberation Serif? It’s obviously not choosing Arial from the source text and is choosing this font deliberately, which older versions of Calc did not do.

I see an indeterminate font (name not shown in font box) which looks like a bug to me (similar to tdf#65458). If I turn off Windows Clipboard History I still see same issue, same with Safe Mode.

You should report it, How to Report Bugs in LibreOffice - The Document Foundation Wiki

I don’t see extra spaces when pasted.