Exception when loading character - "Unrecognised task serialised by server; missing registration?"

Getting the same error after choosing +3 skills as well and then travelling to an area in Act 2 (forgot where but it was a location with a quest)

Found a bigger thread

https://www.pathofexile.com/forum/view-thread/3599022

Maybe we could go on the same thread to always update it to maintain highlighted on the trends

Having the same issue with my Gemling Legionnaire.

UP!

I still getting error after ascended to "Gemling Legionaire" and got the +3 Skill node and put in a new skill on the Skill window.

When i try to login i receive the message "Unrecognised task serialised by server; missing registration?"

They fixed some errors on loggin, but for this especific error on this thread, still happening.

I have the same issue, in my case I did nothing special, just portaled into town where I received the exception.

We need a workaround ASAP until this is fixed - any cache files we could clear?

To GGG: this is a serious bug - we are denied our characters entirely!

Edit update: I deleted all the cache files from "AppData\Roaming\Path of Exile 2" and this did not solve the problem.

Edit update 2 with WORKAROUND: the bug seems to vanish once the server has cleared out the user session or instance. So the workaround for now is to wait without logging with the character until the instance expires. I do not know the exact duration, tips say up to 15 minutes, but I waited an hour or so and could successfully reconnect.