Cannot Pin/Unpin Instances
When viewing an instance's timeline: /timeline/<remote_instance>
you're not able to pin/unpin the instance's timeline to your /timeline/fediverse
feed more than once. For example, if you pin an instance, then refresh, go back to the home timeline and then unpin the instance's timeline, the button will lose all functionality, and you won't be able to pin or unpin any other timelines again.