When a dupe mining falling regolith needs to express themselves they can't do it. Instead they get an extra expression that they store in their errands. They complete them all one by one when they are done mining. So after a dupe has mined 20 tile high regolith stack they might have 20 expressions that they need to do. Camille here only needs to express herself 16 times after she has mined the last few blocks...
Steps to Reproduce
Dupe needs to express themselves while mining falling regolith.
This issue has not been confirmed by a developer yet.