I was reading the Devourer stat block from Volo's Guide to Monsters and noticed that one of his actions (Imprison soul) states:
...the devourer regains 25 hit points, immediately recharges Soul Rend, and gains an additional action on its next turn. VGtM page 138
That made me wonder if a devourer can use Multiattack twice on his next turn.
I can't find anything in the Multiattack rules that prevent this, but it feels weird.