I am not going very in depth because devs should not have released 18a yet - it needs way more time to bake.
Bugs
Players are making ludicrous xp
RWG worlds chunk saves are acting up and essentially eating whole bases
People are getting randomly kicked
Something in math algorithm seems to be horribly broken affecting drops, vending machines, resources, config modifications, zombie spawns, damge, damge output, exp output, tps and fps
Logging in issues and general disconnect - When I first tried vanilla server I actually forced to disable "LiteNetLib" and enable steam networking. Which in 17.4 was the opposite
Now I know you "FUNPIMPS" are a great company and the only reason I took the time to say anything is so that community leaders fix these game breaking issues asap but also because I care about the future of the game. I want you all to have a GOTY tag at some point for Zombie survivals. The other reason I am bringing this to your attention is because I know your not "bethesadic -(pathetic)" and care about your fanbase. Been here since 14.1 and I am not leaving - hope this feedback helps.
One last thing I both completely removed older versions and redid everything and I hosted the server on a 100% dedicated tower with proper port forwarding etc.
Good luck and may we all be funpimping
Ps headed back to 17.4 when bases don't magically poof XD