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Gaios: I'm not sure if I understood you correctly but this is probably not a bug but an intended feature. There are too many servers which force people to download shit tons of files. Therefore users can decide to download only specific stuff.
When you're a server provider / Lua scripter and want to ensure that people actually download the stuff you can still do this with some Lua scripting. Use
reqcld and warn/kick people if they didn't download certain files. Be aware that this is still not a 100% safe guarantee.