@pidengmor @contentiskey Thank you, with all plugins activated or disabled the WP default theme still works. Does it mean my customized theme is problematic?
The jQuery Migrate Helper plugin did not help, though I have it installed just in case.
I’m trying out the Health Check & Troubleshooting plugin. According to it, I have this following problem:
Background updates are not working as expected
A plugin has prevented updates by disabling wp_version_check().
However, disabling all plugins did not solve the problem.
