Steps to reproduce the behavior

1. Invite a new subscriber to a Business or eCommerce plan site that uses plugins or third party themes
2. Log in as the subscriber and accept the invite.
3. Immediately after accepting the invite, there is a button to add a new post to the site. The button does not work, which is correct.

What I expected to happen

A subscriber should not be shown the option to add a new post to a site they have been invited to.

What actually happened

A subscriber is shown the option to add a post. Clicking the button results in a white screen.

Context

3754474-zd

Browser / OS version

Doesn't seem to be related to browser, but Mac 10.14.6 + Firefox 85.0.2

Does this happen on simple or atomic sites or both?

Atomic

Is there any console output or error text?

No

Level of impact (Does it block purchases? Does it affect more than just one site?)

More than one site, bud doesn't block purchases

Reproducibility (Consistent, Intermittent) Leave empty for consistent.

Screenshot / Video: If applicable, add screenshots to help explain your problem.

https://cloudup.com/cmRJBtH47eB