I am using the Collapsable-card config to clean up multiple lights in my rooms.
I was using the hue like card for the lights to rename etc.
I have found that when i use the code under the collapsable card it doesn’t change the title and icons.
it says custom: in your YAML, so it is a custom third party card.
You need to find the GitHub page for that card and then post the issue there or if the author of the card have made a thread on the forum, then find that particular thread and reply to that.
Yes. Suggest you migrate to lovelace-expander-card (MelleD fork) which is active and deals with the issue. The core issue is that some history card does not deal with zero width (which a card with display: none has) so the workaround required is that the custom card uses home assistant conditional card which adds/removes elements from DOM rather than just hiding them.
Up to you I guess. You can put in FR on the maintained expander-card. If the FR are included then that would be a good outcome for the community. For me I did not use those features of collapsable card so it was an easy migration.