When you enter a command in the chat and use more than one space to seperate the argument an errors is shown but the command still executes. This behaves the same in singleplayer and on a server.
Example:
/execute run say t e s tThis seems to be caused client side because a Paper Sever logs the command with only one space into the console.
Sertonix issued server command: /execute run say t e s tAttachments
Comments 2
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We're tracking this issue in MC-65034, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-65034. Technically, it should be erroring, but sending it in chat will trimm all spaces in multitudes to a single space; that is MC-65034.
Command blocks and functions will correctly refuse to run it.