I'm reading through the second playtest module and it involves quicksand, for which it refers back to the Bestiary. The entry for Quicksand includes this in its routine:
"On its initiative, the quicksand pulls down each creature within it. A creature that was submerged up to its waist becomes submerged up to its neck, and a creature that was submerged up to its neck is pulled under and has to hold its breath to avoid suffocation. On its turn, a creature in the quicksand can attempt a DC 18 Athletics check to Swim to raise itself by one step, or to move 5 feet if it’s submerged only up to its waist."
By a strict reading of this, the PC only gets to make one attempt to recover a step per round, in which case they'll just keep see-sawing with the quicksand (on their turn they recover a step, on the quicksand's turn they lose that step again, and then on their turn they recover it once more...).
Is the intention here that that the PCs can recover one step *per action*, getting their normal three? I can see the (1 action) part on the routine but I assumed that applied specifically to the quicksand; that assumption could be incorrect though.