On the whole I agree that waiting it out will do the job, the poop will move in its own time and stop disturbing the nap, however I also think the poop could be encouraged to move.
6 months. Have solids started? If so, look at timing of breakfast solids and move it. You didn't say how far into the nap the poop came, if it is early (lets say 20 - 30 min in) then make breakfast solids earlier (by 20 mins if poss) to try to get the poop before the nap. If it is towards the end of the nap (say 1hr or 1.5hr) then try breakfast solids later (by 30 mins if poss) so the poop waits until the nap has finished.
This would probably need to be tried for several days before seeing a result. As example my DS poops out 24 hrs after he has eaten, breakfast day 1 comes out at the time as breakfast day 2, lunch day 1 comes out after lunch day 2 etc. Not all LOs poop like that obviously, but suing as example to show the digestive system needs time to adjust to a different feeding time to make a difference.
Another thing that can be tried is gentle tummy massage, leg lifts and a backwards C shape on baby's left side, this is the same type of gentle massage used for wind (usually in younger LOs). Not straight after food. This can encourage a poop within the next half hour or so, it just gets things moving.
But otherwise, this poop thing won't go on for ever.