Plugin conflict on css class “hidden”

I just want to bring your attention to a plugin conflict due to a too generic css class.

This is from the file simple-event-planner-public.css:
.hidden {
display: none !important;
}

That css class will make hidden groups on Buddyboss Platform disappear from the group listings for the users that are members of those groups and therefore should see the hidden group listed among for example “My groups”.

It may also cause conflicts in other plugins due to being so unspecific and commonly named.

We have just added the following to our child theme to solve the problem:

#groups-list .hidden {
    display: block !important;
}

But I advise the developers of this plugin (Simple Event Planner) to make the css class hidden more specific.