Not a bug but a request to clean up the playlist entry in XMB. Currently, playlists and history are listing game titles and the core currently associated like so:

This makes the titles longer than is should be and considering that normally, the playlists is created by system, its a bit redundant to associate a core name to the game list, which can be replaced anyways from its submenu's remove core association or overriden entirely using the QTUI (its not overriding the full playlist, only the ones that have not run or no association yet which i think is also a bug). There is a sub-menu each time the game is launch which has or lists list management, information and even a reset core option. This should well fitted here than an additional " | < insert core name here >" text on the titles since you will always run to this submenu anyways.
The title can also get under thumbnails and such when they are enabled.
I have seen at least one person on r/retroarch suggesting the core be hidden behind an option, though I think @retro-wertz's idea is better, as it doesn't require implementing (and subsequently fiddling with) yet another option and still keeps that useful information easily accessible.
There's not really anything to be gained by seeing all of the entries' core listed, so nothing is lost by moving it to the entry-specific secondary screen.
I'd prefer to not list the core in the playlist entries at all. It's somewhat implied by the Playlist name.
Side note, how did the [BIOS] entry get in to your playlist? Were your Lynx files scanned a while ago?
i created my own lynx dat, based on handy-lynx headered roms. the same dat that i pmed you... a while ago...
Did we get that in there? Or did it disappear?
EDIT: Just made an issue. Let's talk there. Thanks!
Overall, I agree the core name doesn't need to be in the entry title.
I think having the core somewhere is useful for troubleshooting. I have personally supported a number of people who didn't realize a core had been assigned to a playlist entry, causing it to use the same (incompatible) core over and over, even after they had used 'load core' to try another one.

Sublabels > long ass strings 馃ぃ
As @fr500 says, sublabels FTW.
Also, @retro-wertz: I'm not sure why you're seeing this extra noise on normal content playlists. It's only shown if you go to Settings > Playlists and turn on Always show associated cores in playlists. By default it should be off, so you only get automatic core display on history/favourites.
it was ON already when i updated. is that documented somewhere? no one else seems to know about that when somebody posted this for an on/off in reddit or when i asked on discord. even if its still in history or favorites only, i think this is better placed under its submenu.
feel free to close this is its invalid then...
Oh, sorry - I know what's happened...
Always show associated cores in playlists was an RGUI-specific option when I first added it 9 days ago (PR #8307). At that point it defaulted to on (to preserve the traditional RGUI appearance).
It then became a 'global' option in PR #8347 4 days ago, with a default setting of off. So unfortunately, anyone who updated during that 5 day window now has it set to on...
Apologies for the inconvenience... (but then again, people who use nightlies are always living on the edge...)
Ah, I see the option now. Thanks a lot for the clarification, @jdgleaver!

This can now be closed.
people who use nightlies are always living on the edge
uh history? favorites?
Well, history and favourites need to show core names, otherwise you have no idea which system each item is associated with. If you want 'clean' entries, just turn on playlist sublabels (works with all menu drivers)
ugh its just making core name smaller and placed on 2nd line. its still there.. but nxm...
:disappointed:
I guess we could make the setting an enum:
Show associated cores in playlists: Always, Never, History & Favourites
But does this overcomplicate things...?
(Also, bear in mind that core names have always shown up on history and favourites, and no one has ever complained before...)