You can craft anything with 1 ingredient of what you want to craft. (in Mineplex's Survival Mode)
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From here yes. However, if you go to Mineplex and find a way to report it to them that would be helpful to them.
Thank you for your report!
However, this issue is Invalid.
The server you are playing on is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the creator of the plugin, add-on or resource pack.
If you have problems on large servers, such as Mineplex and Lifeboat, please contact them first as they run modified server software.
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They do not take bug reports from servers. Servers are not owned by Mojang. It could be the server's fault.