According to What are the reputation requirements for privileges on sites, and how do they differ per site?, some sites have a lowered reputation (e.g. 1-rep) threshold for participating in meta:
This used to work for quite a long time, until probably sometime in 2020, when new users started reporting that they can't post on Meta Code Golf (the known earliest report was on July 24, 2020).
As a 1-rep user, trying to post something on their meta will be met with either:
a text stating that they need 5 reputation to ask a question on meta, with a text box to input a link to their own question
a text stating that they need 5 reputation to answer a question on meta
Why does this happen? And can we get a fix on this?