Repeatable and Arguably Game-Breaking Bug That Freezes HRV Pathing at Spawn
I've found and done a little testing concerning a bug in HRV pathing around Second Wave Holocube blocks and half ramp blocks. Basically, If somewhere along the HRV path you place a half ramp for him to walk over (In this case I discovered the bug in the midst of making a second wave bomb trap hidden by the holocube with the half ramp to diffuse the bombs down two sides of a hallway) and then place a second wave Holocube directly above the half ramp block as if it were a ceiling the HRV will somehow count the path as valid and allow you to activate the map but upon starting the map as a player or in testing will simply stand still outside the base at it's spawn point.
When the genmat is picked up (or activated manually in the testing ground) and the second wave holocube triggers and begins to function like a holocube and not a solid block the HRV will then begin to path into the base to the genmat normally.
I tested on this on a brand new burial site I purchased later and was able to repeat the effect consistently. The holocube must be second wave and sit directly above a half ramp block on a 1 block path for the HRV. If the Holocube is not second wave the HRV paths into the base at start as normal so the bug must be with how the block is treated by the HRV in it's solid "inactivated" state.
The implication here is that it is very easy to bug the HRV pathing with a seemingly innocuous trap placement and, depending on the complexity of the base, hide the genmat behind a maze of false paths and headaches for the raider. This bug triggers all the same complaints about the killing of the HRV by pistons at the start but even more so in this case because there is no way to get the HRV to move forwards until you find and collect the genmat on your own.