Ubuntu 22.04 with Wayland prevents gtkmm drag and drop to popover

I developed a gtkmm application where I drag and drop onto a popover. It worked with Ubuntu 20.04 which uses X11 by default.

When I tried the application on Ubuntu 22.04 which uses Wayland by default, drag and drop onto the popover does not work.

Running the application as admin fixes the issue and running Ubuntu 22.04 with Xorg also solves the problem.

It would be good if the old behavior worked with Wayland and without running the app as admin.
Is there a setting with gtk that could fix the issue?
Should I enter a bug for gtk?
Is it a problem with gtk that I could possibly work on?

A minimal sample app that demonstrates the issue is available here

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