Today I logged in on the feedback site, only to notice all my history being gone.
After further searching, I found out it created a new user for my login, despite me only having 1 Microsoft account.

https://feedback.minecraft.net/hc/en-us/profiles/365162152092-FVbico
https://feedback.minecraft.net/hc/en-us/profiles/418776329931-Steven-Verberne

I don't know why it happend, but I would like it if the histories were merged into 1 of the users.
Loggin in now logs me in as the second account, both loggin in directly, or via github.
No matter what I do, I always seem to end up at the second account now.

EDIT: seems it was caused by my old skype account using same login info, but not merged; they're merged now, but I still get send to the second profile all the time. So if the former profile's activity can be merged into the latter's, that'd be great