Scale help for /execute store is not shown until it is already written

To reproduce:

• Type "/execute store result block ~ ~ ~ Items int" into chat.
  Result: No syntax help for the next argument.

• Type a space after it.
  Result: Error preview "Incorrect argument for command at position 43: … Items int<--[HERE]"
  The actual error message when executing the command like that is "Unknown command\n… Items int<--[HERE]".

• Type any character.
  Finally the help text "<scale> -> execute" shows up.