Maybe this is intended but…
In wiki posts, there was an icon at the top right that allowed to access to the edit history. Now, the icon located there opens the edit mode, just like the “Edit” button below.
See for instance Maps for EQlzr users and topics - About EQlzr - EQlzr
It has been a while that I haven’t checked the version history of a wiki post, and therefore when this change happened. Is there some configuration that I am missing?