Incomplete commands targeting multiple entities display the usage more than several times
If you don't do a command completely that has more than one entity targeted, it will show the usage multiple times.
Run this command
/tellraw @e[c=2]
Assuming there are at least two entities in the world, you will see this in chat:
Usage: /tellraw <player> <raw json message>
Usage: /tellraw <player> <raw json message>
even though only one command was executed.
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However, this issue has been closed as a Duplicate of MC-63748.
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