Still affects 25w19a. Given the centrality of having a Ghast in the new update, it's a good time to fix it.
Well, I decided to keep this ticket as is and open a new ticket for the aforementioned issue (carved pumpkin overlay on F1), hoping it won't be closed at the beginning.
@MrMuskle Bro, I just opened this ticket to suggest carved pumpkin overlay shouldn’t hide when on F1, all other content was additional and offered as a cover for that suggest, and simply you've cleared the main point of the ticket by removing that suggest. (actually, I had already seen the ticket regarding the carved pumpkin overlay, and since I didn't accept the answer given to it and couldn't open another ticket on the same subject, I opened the current ticket with a few more things added.) (However, I think it's really a bug that the carved pumpkin overlay is hidden when using F1.)
I don't really think that Ghasts should be leashable. currently, only a few mobs (and a very small number of neutral and hostile mobs) can be leashed.
https://minecraft.wiki/w/Lead#Leashing_mobs
Can confirm in 1.21.11-pre3.
I think this is the most problematic bug in recent versions of Java Edition after the sand duplication bug with the End portal was fixed, and it would be nice if it was fixed soon.