We are facing the problem that we can't add an activity or resource after the moodle upgrade.
When we try to add activity or resource the screen just freezes and nothing happens
We also tried to apply other themes and upgrade to the newest version (3.9.1+) but we are stuck with the same result.
Moodle version - 3.9.1 on Linux
Theme - Lambda
PHP version - 7.3.19