Game Version: 2.8.5288199
Town Centers are blocked from finishing despite reaching 100% construction status. At this point, they have to be deleted for the player to be able to build them.
Clip 1 - Clip 2
Note that selection and hover will indicate different HP completion status - this is likely where the issue comes from.
- Construct a town center as normal, with several workers
- Removing and adding villagers/norse infantry to the settlement under construction seems to increase the likelyhood of this happening.
- The deathmatch mode seems to more commonly have this. It may have to do with the build rate modifiers.