while I will some systems still keep on Joomla3,
this behavior is not the right one - isn't it?
when I tried the update from 8.4 top 8.5 it throws me out while trying to install 9.0 ...
https://cloud.schmakowski.info/index.php/s/yF9cAws7RmsCykZ
https://cloud.schmakowski.info/index.php/s/kPr8F78SYzojtjH
https://cloud.schmakowski.info/index.php/s/oA9Q8gEgm29PWnL
Just to let you know ... the update to lifted PHP-version ist not really important 😉