Looks to be coincidence as the "Enhanced Search Bug Reports" is working correctly with prefixes.Could it possibly have anything to do with prefixes? Probably just coincidence, but the fact the forum only indicates 3 discussions when there are actually 6 (+ 1 sticky), 3 of which are prefixed makes it seem so.
A more likely hypothesis. Also seems to be exclusive to xenforo.com unless someone claims otherwise. Could you perhaps test your theory when the opportunity arises?It could be related to moving threads.
It's not just the bugs forum.
The general feedback forum for example shows 1876 threads on the forum index but 1939 when in the forum.
Pre-sales 3313 and 3391, etc.