SwiftKey refuses to let me type accented characters on a physical keyboard using Parallels Client

I love Swiftkey, but it doesn't work correctly in combination with an RDP client like Parallels Client. Whenever Swiftkey is enabled as the current input method in the Android settings, typing accented characters (and sometimes pressing backspace) doesn't work well in the Parallels Client. When using Gboard as my main keyboard, everything works fine, but with Swiftkey, characters are shown twice, lliikkee tthhiiss, and accented characters aren't working as it should when PC keyboard mode is enabled in Parallels Client. Could this be fixed?