I was building a large water tank to the south, with a long column of ladders. I had dig and build instructions queued in the bottom, several of which were immediately accessible, but not all of the accessible tasks were lit up (white icons): When any duplicant was in the water, it properly showed all accessible tasks. However, if all duplicate were out of the water (they were headed to get supplies), then several of the tasks lost their accessible status.
I believe the issue is pathfinding related. All of the tasks next to the ladder showed as still accessible. The tasks which required the duplicant to jump off the ladder were not.
I can upload screenshots if requested. Not sure I have the save file anymore.
Steps to Reproduce
Que build tasks under water; some accessible by ladder and some by ladder —> ground.
This issue has not been confirmed by a developer yet.