Messing around a bit with the html here. Maybe Discourse should add some tag(s) and that would solve the problem?
The first one is just an example, maybe some lang addition?
The second one (from above) has some funny stuff after the rel, maybe that messes things up.
https://usnconeboxax1aos.cloud.onebox.dynamics.com/?cmp=DEMF&mi=CustParameters&lng=en-us
<h3><a href="https://www.facebook.com/groups/vaellusgroup/permalink/10159228526086173" target="_blank" rel="noopener">?????????</a></h3>
Just thinking out loud here…