Cannot load this map on the servers, crashes immediately.

[0244.67] Log: === Critical error: ===
ReadFile beyond EOF 338975198+4/338975198 for file F:\KF2Server\steamapps\common\killingfloor2\Binaries\win64\..\..\KFGame\Cache\894316466\1\BrewedPC\Packages\la.upk

I checked on my server, and with 3 another servers, everything is working ok.
I believe your server is missing a map file or it's outdated
Do a cache cleanup on your server by deleting the directories:

KF2SERVER\KFGame\Cache
KF2SERVER\Binaries\Win64\steamapps

If you are placing the files manually, let the server download, just edit the PCServer-KFEngine.ini and add the lines at the end of the file
[OnlineSubsystemSteamworks.KFWorkshopSteamworks]
ServerSubscribedWorkshopItems=894316466

I got it working after deleting the files having the workshop redownload them. Not sure what caused the problem initially. No error on my part. No missing/outdated files either, I just installed your latest version for the first time and that happened. Possibly a workshop bug, who knows. I've installed hundreds and hundreds of workshop maps and never had this problem. If it happens again, it's something with the la.upk for sure. For now, it appears to work and isn't crashing the servers. Thanks

So as soon as you move in our server you fall through the map.

Spidermang u server probably is missing the file la.upk