I've tried this with two different "players" in my quest.
When you kill the boss (Aquamentas Lv 1) you don't get the heart container until you leave the room and come back in.
Screen flags checked are; boss roar, enemy = item, and hold up item.
Item is NOT set to fall from ceiling.
NO dmap flags are checked.
In both cases I was using cheats with the clock set if that matters. 😉
EDIT;
Go figure...
I just played completely through the level, no cheats, and the Heart container showed up like it's supposed to.
You got me. 😉
Hmm, I don't know about the boss room thing, but here's another odd one using lv4 cheat:
Link had the bomb bag 1.
Bombs randomly went to 0 sometimes after picking up dropped bombs.
Trying to "cheat" more bombs failed.
Link had equipment items for this "checked".
I ended up getting around this by cheating the lv2 bomb bag, and pressing "b".
Then randomly the same thing happened again so I gave Link the lv1 bomb bag. And repeated...
Init data was set to max/cur bombs to 0. also
I'm also not sure if B bags are supposed to permanantly increase your max capacity because under link data w/ cheat, bomb max is still 0. Wait that makes no sense...there is after all + max in the editor. 😃
Yep, there's a gremlin in there somewhere. 😉
Update,
s2dve just played through (no cheats) and the Heart Container didn't show up for him when the boss died either.
He had to go back for it.
All my other items are showing up when the enemies die so It must have something to do with the boss room flag, unless it's because it's the only item of all of them that doesn't fall from ceiling.
Could you please post the quest, dmap, and screen?
THis is the one I was talking to _L_ about, there's a good chance it's being caused by flying tiles in the room so even though the boss is killed, they still act as an enemy and stop the item from showing up.
I "believe" he may have fixed this, but don't quote me.