Subscribe Calendar button is missing if restriction is applied

Problem Statement

If a calendar has edit restriction applied to it, an unrestricted user will not be able to see the "Subscribe" button.

Steps to Replicate

1. Create a test calendar with no restrictions
2. Create two test user (user1, user2)
3. Both users are able to see the "Subscribe" button on the top right-hand corner (next to the "Add Event" button)
4. Apply edit restriction to only user1
5. Log in as user2 and check if the button is still present

user1 will see:

user2 will see:

Workaround

The 'subscribe' button can still be found in the options (...) drop-down list