I found out by accident and it took me a while to figure out what was happening that caused the problem.
- On phone, in the browser scroll down.
- At some point the URL bar disappears (Chrome or Samsung Internet)
- Then scroll to the footer until you are at the bottom of the page
- Scroll up again (menu still visible)
- Scroll all the way up and the header will disappear
Header also doesn’t come back unless you refresh the page. It happens 9 times out of 10.
Happened in browser Chrome and Samsung Internet on a Android. Others not yet able to test.
Pro version: 5.1.3
WP version: 5.8.1
PHP version: 7.4.25
It happens on all websites, but to replicate you could use https://bureauhamers.nl/.
Settings header bar: