Bug in Missions when henchmans are full

There is a small but annoying bug in the missions that only happens when the henchmans are full.

If you are full of henchmans and try to collect a mission, then get rid of the henchmans so you can collect the mission, the mission button will be greyed out so you can't replace the mission.

This happens only when you are full of henchmans. If it was money that was preventing you from replacing the mission, everything works as normal when you spend the money. It even happens on missions that do not reward henchmans as a prize.

this doesn't happen on iOS