I have a few dig/build tasks set on priority 9 as I am out of algae and my dupes keep sweeping (priority 4) and ignoring my priority 9 commands no matter what I try.
Steps to Reproduce
Dupes were building/digging in an Ice Biome (priority 5) when I realized I was low on Algae. So I started a new build of ladders/digging on priority 9. They did some but started choosing the other priorities over the 9.
This issue has not been confirmed by a developer yet.