Cannot unspec colossal capacity to respec

You cannot unspec colossal capacity in the final room in Sekhemas to be able to respec into a different ascendancy. I assume this will also behave the same in the trial of Chaos.
Even with the rucksack empty you are unable to respec the point. The only way to do so is to empty the rucksack, logout/leave the area, and then respec the point....which you can't do in the trial room.

Just logged on after a month and this was the first thing I wanted to do. Kinda killed all my motivation.

Tested a bit more in hideout and it seems if you any item in the rucksack while opening the respec screen you will have to leave the area or logout to reset it. You can freely add items into it, but it must be empty when respecing or it bugs.