Google Search Console is reporting more and more forum pages the Google Bot can't find, and this error is typical. My forum is hosted in the 'forum' sub-directory of the root directory on the website. If the domain name is 'example.com', the forum is located at 'https://example.com/forum/' and URLs of all topics and posts should start with 'https://example.com/forum/'. However, Google finds a lot of pages which start with 'https://example.com/forum/forum/' and sure, it can't find them, reporting a server error 5xx for all them. I can't find those pages, but it seems Google knows how to find them as the number of such errors is constantly increasing.
I've checked the Forum Base URL Mask parameter in the Admin Settings and it correctly points to 'https://example.com/forum/', so I have no clue why this problem occurs. Can you help me with that?
P.S. Currently using YAF 2.31.2. As I remember, I never experienced this problem earlier and it appeared after upgrade to YAF 2.3.