Emergency Garbage Collection pass ? and no depth map

[Shuffy]

this came up on my log today ...

2019-07-02 18:09 WARNING: performing emergency garbage collection pass - memory went from 90719 KB to 136388 KB in less than one frame
2019-07-02 18:09 INFO: usage is now 90672 KB; full GC took 130.036482ms

also i have this error which i have no idea whats causing it

2019-07-02 13:47 Error: No depth map available, but shape 'drivingDust' (emitter1Ref) with material 'fx_smoke01_mat' uses a custom shader which requires reading depth data.

[levisbaja]

same issue here, i can't figure out what the hell is this...

[Shuffy]

the depth map error comes up on all maps with no mods . just randomly pops up

[hpmc13]

Count me in, too, at least on the first message. Got a bunch of them in my log.