We noticed that people are able to cheat on a server by either going onto a solo world, or going into another server. Not sure if it intentional, but there should be a way to block people from progressing in this manner.
#People Are Able To Transfer Progression Between Servers
abstract veldt
fleet idol
Why do you think this is cheating?
That seems to be an intentional mechanic so that we can play together with friends who may sometimes want to play solo.
dark sky
This is intentional and Windrose using same mechanics as Valheim for example. The possible solution if devs add some sort of character bindings to the server (server-side setting) or there'll be similar mods from community like in Valheim to achieve this.
magic hinge
While I certainly understand the concerns about cheaters, being able to go to your solo world to farm mats to bring to a busy server is very useful. If we're constrained to only mats on the server's world then competition for those resources is pretty tough. Especially with having to wait for ores to respawn, for example.