Steps to replicate the issue (include links if applicable):

• Open web browser where I was logged in the the past
• Open any page of a Wiki

What happens?:
This happens sometimes with no clear pattern:

• I am still logged in on my home wiki Commons and all other Wikis they only have one language version (Tested: Wikidata, Meta, Wikispecies).
• I am logged out on all Wikis with multiple language versions (Tested: Wikipedia, Wikivoyage, Wikisource) and MediaWiki.
• CentralAuth on the Wikis where I am logged out does not work until I log in on one of them, then CentralAuth works again for all of them.

What should have happened instead?:

• Login should not be lost and CentralAuth should work.

Software version (on Special:Version page; skip for WMF-hosted wikis like Wikipedia):

Other information (browser name/version, screenshots, etc.):

• I have 2FA enabled