I don’t know if this is new or a longstanding issue, but in the latest beta (Version 25.06b7 (ad34b76f)) on Windows 11, keyboard shortcuts using the Ctrl key only work with the left Ctrl key, not the right Ctrl key.
Edit: Okay, mystery solved. This only happens when the French (Canada) Canadian Multilingual Standard keyboard layout is in effect. Online search shows that this layout remaps the right Ctrl key to become AltGr, so typing Right-Ctrl + e gives œ, and similarly for various other special characters. Sorry for the false alarm.
To make sure the right Ctrl key isn’t broken on the keyboard, you can try holding it down while turning the mouse scroll wheel, which increases or decreases the font size in most Anki windows.