Copy-Paste in xfce4-terminal adds 0~ and 1~

The issue is that your terminal is in bracketed paste mode, but doesn’t seem to support it properly. The issue was fixed in VTE, but xfce4-terminal is still using an old and unmaintained version of it.

You can try temporarily turning bracketed paste mode off by using:

printf "\e[?2004l"

My issue was due to a badly-closed bash session. So running command reset in my terminal solved it immediately.

I had the same issue, it occurs after I use vi.

Mine was resolved by adding set t_BE= to my .vimrc file.

For reference, this is what t_BE does:

t_BE enable bracketed paste mode