Hi,
Hmmm, this does not have to mean its an actual bug in Storefront. I have about 40 sites and shops running on Storefront and they do not have issues even with the latest version 2.2.3.
If I understand correctly, the woocommerce customizer ( third party plugin ) is now deactivated and can no longer get activated eather?
Was the woocommerce customizer ( third party plugin ) activated when you had the 2.2.3 back too? Or are these issues only if that plugin is ative?
It can still be some conflict with some other plugin..
Best advice always test new updates in a staging site, not live. If things go south in staging, you can first fix that before messing up the live shop!
Annie