Geany selection buffer broken (middle mouse click copy/paste)

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I use Geany a lot, and one issue I have is the lack of selection buffer copy and paste.
It is very convenient: select some text, then switch to a different program and press the middle mouse button to paste. No reaching for the keyboard to press ctrl+C and ctrl+V.
That works fine on all programs but geany. Especially useful when shell scripting and I want to paste some commands from geany to the terminal. It worked fine on Bullseye, so I think this is an issue related to Wayland.

Is geany using X11? I would assume so as the internet says the selection buffer does not transfer between wayland and xwayland.
But maybe geany is running in wayland because it does not show up when running wmctrl -l.