MacOS 10.15 Catalina includes a new Mongolian Cyrillic keyboard, but it does not do the Command level correctly, so that common shortcuts for copy/paste, etc. do not work. A custom keyboard which fixes this problem can be found here.
Thursday, February 13, 2020
Thursday, January 16, 2020
It appears that the Brazilian ABNT2 input source provided by Apple can have the characters to the left of the 1 key and to the left of the Z key switched from what users expect. A custom layout that fixes this problem can be gotten here.