Trying to run a /trigger command when it is not enabled results in the error message "Invalid trigger name [objective name]", rather than the appropriate "Trigger [objective name] is not enabled".
Edit: It only gives the wrong error message before the trigger has ever been enabled. If it has been enabled and triggered, it will give the correct error message.
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Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases. If this has been done, we can reopen the issue.
Keep in mind that the "Resolved"-Status on this ticket just means "Answered", and that we are waiting for further information on whether this issue still exists or not. We will reopen it as soon as the requested information has been delivered.
I think this was already reported, but I can't find the original report 😞