Hi,
There could be a conflict with some v5 plugin. Can you try to uninstall v5, you can safely uninstall everything with a version lower then 9.6.0. You won't loose any data, the v5 database tables remain untouched.
If you're on PHP 8, please lower the php version to 7.4 on your hosting account prior to uninstalling v5. Once v5 uninstalled you can switch the php version bacvk to what is was.