So apparently if you use the retopologize tool on a landscape it messes up the collision.
My character doesn’t fall through for some reason but static meshes with physics on do.
It’s 100% reproducible from my end.
Is there by any chance a way to rebuild/unretopo a landscape in order to fix it?
(using 4.4.0 btw)
Hi TK-Master,
Thank you for the report. I’ve been able to replicate this in our internal build of the engine and have submitted a bug report (TTP:346165). There is no timeline for when this will be fixed but as soon as a fix is submitted I will verify and post back here for an update.
Thank you!
Tim
Alright thanks for the reply Tim 
I hope this get fixed in 4.5 since I kind of have ruined a couple of maps.
Unfortunately, there is no guarantee, but I will keep you and this post apprised of any status changes!
Tim