Hi,
This means that the modifications you made in the view file of the product page were not valid anymore with the new way the product page is done. Deleting your view override and adding back your modifications to the new version of the view file will indeed solve the problem.
Any time we deeply change the structure of a view file, such issue could happen, even though we try as hard as possible to avoid any backward compatibility issue. Unfortunately, we cannot think of all the possible modifications users could do and we need to do these modifications if we want HikaShop to continue to improve.
So will it happen again in a future update ? Maybe. Can you do anything to avoid them ? First, test the updates on a copy of the website before updating your live website. Then, if you can do your modifications with just CSS, then do them with CSS instead of editing the view files.