PyGObject: Segmentation with signal “activate link” in a markup-text label

[c buhtz posteo jp]

X-Post: https://stackoverflow.com/q/66483316/4865723

Hello together,

I observe a segmentation fault when using a hyperlink (as markup text) 
in a Gtk.Label. I am not sure if I use Gtk the wrong way here or if this 
is a bug.
Details and an MWE can be found on StackOverflow: 
https://stackoverflow.com/q/66483316/4865723

Using an alternative GUI element is a workaround not a solution for me. 
In the original code I use a lot of mutliline (markup) text in the label 
element.

Should I open a bug report?

Kind