In this case, please, confirm the permission for plugins deactivation, and switching to the parent/default theme. As soon as we complete the testing we will enable it all back.
Twice defined “Product tabs” caused that issue, even if the tabs are hidden so I left only 1 enabled – https://prnt.sc/L9-fhtOprJ1P and it fixed the issue. You can check the staging site now and be sure of it.