The /title command treats an invalid second argument as "title". Expected would be that it shows an error message stating that the argument is not valid.
How to reproduce
Use the following command
/title @p invalidArgument ["Title"]
is duplicated by
MC-122397title and tellraw inconsistent JSON parsing
Resolved
relates to
MC-111704You can input any value in [old block handling] of setblock and fill
Resolved
MC-117933/clone command treats invalid optional arguments as if they were default