I dont know if it was a bug or not, but using the wand you get from the hag i was able to summon the zombie along with my companion which might indicate you can have multiple summons.
i dont play 5e but it is my understanding that some spells require concentration, maybe some summons require this so you can only have one summons at a time while others dont require concentration and would allow multiple summons.

If the game dosent allow multiple summons then +1 please allow us to summons as many as we want with time restrictions or some other limiting mechanic, i love being a summoner and summoning armies of monsters.

Last edited by jayn23; 06/12/20 08:06 PM.