Just after writing the last reply, I have seen that ACF 6.2.2 is released. Just install it and as said in the changelog, the issue is solved.
As I said in my first post, changing any ACF options based on taxonomy, make the block to disappear.
So yes, the trick of selecting the category and updating the product to make ACF block appear works but it doesn’t allow to do anything with it.
Maybe the fact that my issue appears with a precise WC update and is solved rolling back to previous version plus the fact that it can be perfectly replicated will help developers to find something.
This is what I did too for the moment.
I also send a ticket reporting the issue. People at WP Engine kindly answer that they could replicate the issue and it’s under investigation. If they come with a fix, be sure I’ll share in this thread.
I see an error in JS console:
[Error] TypeError: undefined is not an object (evaluating ‘e.getActiveMetaBoxLocations’)
onRefreshPostScreen (acf-input.min.js:1:82303)
o (acf.min.js:1:1423)
doAction (acf.min.js:1:589)
(función anónima) (acf.min.js:1:19488)
renderPostScreen (acf-input.min.js:1:80681)
success (acf-input.min.js:1:77961)
c (load-scripts.php:7:25272)
fireWith (load-scripts.php:7:26017)
l (load-scripts.php:7:77733)
(función anónima) (load-scripts.php:7:80206)
