Search of threads by author not working properly

Hi,

I did 4 builds in total in the appropriate forums. Despite that, only 2 appear when i search in all the classes subforums with me as author and threads only.
Here is the link of the search.
All 4 builds have a tag. Missing threads are this new one and this one.

It looks like despite they're forum threads, they're considered as posts and not threads therefore we can't filter like that anymore. Pretty strange, and quite unfortunate.