Here’s what I did:
- Made a backup of the site.
- Changed the permalink of the static shop page you mentioned.
- This created a distinction between the CPT slug and the shop page
- Confirmed that this made no difference to the problem I am reporting here.
- Changed the permalink of the shop page back to /shop
- Changed the rewrite slug of the CPT.
- Confirmed that this made no difference to the problem I am reporting here.
- Changed the actual slug of the CPT and migrated the posts as is recommended.
- Confirmed that this made no difference to the problem I am reporting here.
- Restored from my backup to fix the mess this experiment made.
So… the solution you are proposing had no effect on the landscape here. And honestly, why would it? the Blog archive and the CPT and the manual shop page I created have nothing to do with one another. The Blog menu item is active as if I am viewing a regular blog post when I am in fact viewing a single post of the CPT.
Please look more at this problem and advise.
thanks.