Hello there,
I don’t know what exactly was the problem for not editing the classic editor (finally general, not only in woocommerce) but it seems to play a roll the plugin for the classic editor. Afterwards I had to had restore the website and added a filter in functions to disable the gutenberg editor which worked fine!
I thought there was some problem according your anouncement to update first the woocommerce plugin and next the wordpress.
Thank you for you interesting
Manolis