tmux-yank often copies non-existent lines under the line until the bottom of the screen

[eggbean]

I previously thought that there was a problem with the tmux_is_at_least() function, but after making some changes I realised that it was that. I don't know what's causing it, but I often have tmux-yank copying all the space under the line where there are none, until the end of the screen.

I end up with copied text like this:

<copied text that really exists>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\

To use the copied text I have to go to tmux registers <prefix>,= and then type e and remove the line breaks. Using tmux 3.3.

[bruno-]

I confirm I also get this sometimes.
Any help with fixing this is welcome.