Activity single page with plain permalinks is endlessly redirecting the user

[imath]

As shared by @johnjamesjacoby into our Slack channel:
​https://wordpress.slack.com/archives/C02RQBYUG/p1705982391019319

The root of the issue seems to be located in this part of the code:
​https://github.com/buddypress/buddypress/blob/master/src/bp-activity/screens/permalink.php#L66|L70

My guess is: when plain permalinks are on, BP action ( p ) and BP action variables ( array( $activity_id ) ) are query vars coming from the click on a single activity link. These are wrongly added to the redirect link.

Remove potential BP URI query variables from activity permalink when redirecting to the activity single screen.

Trac ticket: ​https://buddypress.trac.wordpress.org/ticket/9082

[imath]

In 13714:

Ensure single activity permalink router is reliable with plain links

When building the URL to redirect a single activity request to the member's activity single view, make sure to remove potential BP URI query variables relative to the Activity component before trying to transport extra query variables to the redirect URL.

Props johnjamesjacoby

See #9082
Closes ​https://github.com/buddypress/buddypress/pull/225

[imath]

In 13715:

Ensure single activity permalink router is reliable with plain links

When building the URL to redirect a single activity request to the member's activity single view, make sure to remove potential BP URI query variables relative to the Activity component before trying to transport extra query variables to the redirect URL.

Props johnjamesjacoby

Fixes #9082 (branch 12.0)