Enter, Ctrl combinations, Alt combinations do not get sent to Android from Windows

Trying to type enter (both return and keypad enter), any Ctrl key combination, and any Alt key combination (except Alt+X which disables input lock) does not get sent to Termux on Android from KDE Connect on a Windows host. This is regardless of if I use global input or activate the KDE Connect keyboard. Enter and some common HIG shortcuts like Ctrl+C do function properly in other places. Any solution for this? I want to avoid having to try and get my YubiKey working with SSH under Windows, or even having to install a proper terminal emulator at all.