Steps to reproduce:
Using Safari on an iPad with iPadOS 13.4.1
- Log out from Wikipedia or any Wikimedia project.
- When logging in again on a Wikimedia project, switch from mobile to desktop site, or vice versa, on the log-in page, using the footer link.
- After having logged in, directly or after a while switch back to the mobile or desktop site, using the footer link.
Expected result: Still logged in.
Actual result: Logged out.