For example, you type /help to get the usage of /locate and /gamerule. The <gameruleName> and <structureName> shouldn't be listed entirely in the command help.
See the usage of /gamerule and /locate in the pictures.
MC-135853
Arguments in command help are sometimes listed unexpectedly
Resolved
Duplicate
0
(Unassigned)
Unconfirmed
(Unassigned)
/gamerule, /help, /locate, argument, brigadier, command, command-syntax-help
Minecraft 18w31a
Retrieved
This is contradicting MC-135850 where you not that the help is incomplete.
Only one of both tickets can be valid.