"'Showpost' URL Format" works only for the first post

I have a strange issue with the "'Showpost' URL Format" setting.

It's set to "f[forum_id]/[post_id]-post[post_count].html" and works correctly only for the first post in thread. Other posts are without the "[forum_id]" value and therefore return a 404 error.

In other words:
The first post in a thread (correct): forum/f11/160613-post1.html
Other posts in a thread (incorrect): forum/f/160618-post2.html

If this is set to the default value "[post_id]-post[post_count].html", the URLs are all correct.

What could be causing this?

vBSEO 2.1, vB 3.5.0

Originally Posted by PageUp

I have a strange issue with the "'Showpost' URL Format" setting.

It's set to "f[forum_id]/[post_id]-post[post_count].html" and works correctly only for the first post in thread. Other posts are without the "[forum_id]" value and therefore return a 404 error.

Yes, showpost generated pages are not associated with a forum natively, therefore, the script can't use variables like [forum_id] or [forum_title] to build these URLs. Hence the options through the vbseocp are so limited for this rewrite.