David Christensen wrote:
On Debian 9 (and 10, and earlier?) with Xfce Terminal, when I select
an entire line of text in one terminal and then middle click paste in
another terminal window, the entire line is pasted; including the
newline.
[...]
On Debian 11, when I select an entire line of text in one terminal
and then middle click paste in another terminal window, the line is
pasted without the newline; requiring me to select the target window
and press <Return>.
If you use bash,
https://utcc.utoronto.ca/~cks/space/blog/unix/BashBracketedPasteChange
probably explains what you're seeing.
regards,
mike