NHF – new heroes for Heroes V 3.1.

some angels, including Belket, were stationed near the Necropolis, along with several human units – has the issue with their flags been resolved?

If there are no canopies (head effects, for example), then you can only attach a flag to the map. For the idle animation. And use a flag from the Rangers, stuck in the ground. Or a human flag, I don't remember if there's one or if a boy is always holding it.
I taught the Lord to teleport in a similar way. That is, he has an idle animation, but it disappears during movement, and the corresponding effects are applied.
Alright, I'm leaving. Good night, everyone!