BuddyPress.org

[This is a repost as my first post seems to be corrupted, cannot be edited and doesn’t display on the site]

Hello, I am seeing an issue where the BuddyPress plugin seems to be breaking the forum “Subscribe” / “Unsubscribe” links on bbPress. Strangely, it works if JS is enabled (and therefore XHR is used), but does nothing if JS is disabled and the embedded link[1] is used. It just reloads the same page without actually changing the subscribed / unsubscribed state with no errors.

Notes:

• I have tested this with all other plugins disabled.
• Disabling the BuddyPress plugin causes both to work correctly.
• Tried enabling / disabling all combinations of Buddypress bp-components with no effect.

I upgraded both plugins and PHP to the latest versions:

PHP: 7.4.10
Wordpress: 5.5.1
Theme: Divi 4.6.5 (tried others like twentytwenty 1.5)
bbPress: 2.6.5
BuddyPress: 6.3.0

Questions:

• Are there any known issues I should look into?
• Any suggestions where to look for debugging? I have WP_DEBUG enabled, but nothing useful in logs. I have tried using Query Monitor plugin, but its a bit unclear where to start looking.

NOTE: I am new to WordPress and its plugin architecture, but have extensive HTML/CSS/JS/bash shell experience and am comfortable in PHP.

Thanks in advance!

Jonathan

[1] Embedded subscribe link which fails: /forum/FORUMNAME/?action=bbp_subscribe&object_id=361&object_type=post&_wpnonce=XXXXXXX