Bridgy Fed follower crashes ActivityPub Followers block in WordPress

[cybeardjm]

I first reported the issue here: Automattic/wordpress-activitypub#571, but IMHO, the issue comes from how the username/URL is handled via the bridge.

In short:
1 - I created a blog and connected it to Bridgy Fed
2 - via IndieAuth I followed the author on 2 of my blogs who use the ActivityPub plugin for tests
3 - both of these blogs have a page where the "ActivityPub followers block" appear.
4 - for "no apparent reason" both of the pages started to crash in view or edit mode.
5 - it appears the way the "Bridgy Fed" follower is created, mainly its URL, generates bad information to the block when used.
6 - once the "Bridgy Fed" follower has been deleted from the list, the block works again and the page that contains it can be viewed or edited.

[snarfed]

Hmm! Sorry for the trouble. Looks like you're right, the WordPress ActivityPub plugin chokes on multiply valued url fields like Bridgy Fed has for your test blog. I'll follow up on Automattic/wordpress-activitypub#571

[snarfed]

Tentatively closing here; let's track in the WP plugin issue.