I am using a Mac with English and Greek keyboard. In order to change language I use the crtl-space keyboard shortcut. When I am connected to another pc I cannot use this shortcut to change language. Also if I change the remote computer's language using shift-alt combination, my Mac continues to send characters in my mac's selected language. This started happening after a TeamViewer update during November or December.
My OS is macOS Catalina v10.15.7 and I have installed the latest version of TeamViewer
I also tried a clean installation of TeamViewer