Best way to pass an OS loophole up to the developers?

I found sort of a loophole that could cause serious problems to someone who uses this feature of their Macs. In the middle of a lecture class, I changed the language of my keyboard so I could type in another language. I am listening to the professor who is telling a story of interest so I leave my MacBook alone long enough for the screensaver and lock to engage. I heard an important point the director had said so I quickly tried to unlock my Mac to note the point he made, but my password didn't work. I tried and tried checking caps lock and using different shift keys, but nothing worked. I realised because of the language change I could no longer type the symbol that was in my password. Then I had no note taking ability and was forced to try to remember every impotant thing that was said in that class. Luckily it was towards the end of the class. After school I drove straight to the Apple store for a walk in appointment which involved quite a wait. They reset my password, but gave me no solution but to not change the language and lock the computer.
Now because this was a software language change, I believe adding an external keyboard would not solve the problem. Has anybody experienced this or have heard of this before?
And my main question;
Is there anyway to email someone where it could be noteworthy to the developers?
Thanks!
Henry

If you're unable to log in because the login screen language doesn't match your keyboard, press the key combination  command-space or command-option-space to cycle through the available languages.
To change the language persistently, see this support article.

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