Pips have trouble planting unplanted seeds.

Not sure you're experiencing a bug. Pips will try to plant even if there's no more available space due to planting rules. Isn't it what's happening here ?

If it's about the room with 3 pips, that's exactly what happen. There's no place in the room where a pip can plant a seed without more than 2 other plants in the surroundings.

 

(This rule should be explained in the database. Me too, the first time I try to plant via pips, I tough the rule was related to a number of plants per tile in a room, just like critter overcrowding.  )

13 hours ago, Gwido said:

If it's about the room with 3 pips, that's exactly what happen.

It's not even a room, sometimes they just drop seeds in one spot, pick it up again, and then drop like it's a insane loop. It's kind of sad.

same problem here...