@Hugo. I understand… but it felt frustrating seeing all the issues being solved or acknowledged. I never felt so “alone” on any WP related forum. Although I really understand and share your point of view, my answer reflected the feeling I had on BBPress forum at that very moment…
I also know that expecting an answer within minutes is not possible… but as you can imagine, the loss of 24000 treads is a situation where feelings get over very easily!
As the frustration passed, here what happened…
As always, weird behavior of a plugin is often related to conflicts with other plugins, especially at WP core updates. Although I have deactivated all BBPRESS related plugins with no success, nothing worked to correct the situation.
The conflict was found: Relevanssi’s plugin
I have found a solution. Thanks anyways…