Thanks for reporting this issue. I have opened an issue 
(https://github.com/sagemath/sage/issues/35889) and will propose a fix asap.

On Sunday, July 2, 2023 at 6:37:45 PM UTC+2 Georgi Guninski wrote:

> You definitely can construct graph with incomparable vertices
> and they worked as expected in python2. python3 regressed them
> and devs are doing workarounds.
>
> The new testace is:
> G=Graph([("A",1)])
> G.feedback_vertex_set()
> ===
> File /home/sc_serv/sage/src/sage/graphs/connectivity.pyx:287, in
> sage.graphs.connectivity.connected_component_containing_vertex()
> 285
> 286 if sort:
> --> 287 c.sort()
> 288 return c
>

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