Update billing details fails when no State/Province entered
Update billing details gives "Page could not be loaded" on submit if the user has not entered a State/Province. In some cases, it is valid for a user to not enter a State/Province if they live in a country that does not have states. This works as expected on contribution pages, etc, but not on the update billing details page. Tested on 5.35.2.
I will have a look at how this is handled for contribution pages and port the solution to update billing details, at some point.