Unicode input for Linux doesn't work for all applications

[LukeXuan]

Depending on the application, CTRL and SHIFT might need to be pressed for the whole sequence (except for the terminating SPACE). Here's the script I'm using right now,

ZMK_BEHAVIOR(iris_sep, macro,
    wait-ms = <5>;
    tap-ms = <5>;
    bindings = <&macro_press &kp LCTRL &kp LSHFT> ,
               <&macro_tap &kp U &kp N2 &kp N2 &kp N1 &kp N7 &kp SPACE> ,
               <&macro_release &kp LSHFT &kp LCTRL>;
)

For my limited test (well, Firefox, thunderbird, and Emacs), "pressing throughout" style works for all of them, but the current macro doesn't work in Emacs.