[Bug] Cannot release a 2 key combo on a single key release

[nyliya]

Describe the Bug

I made a simple combo that sends X when both A & D are pressed.

enum combos {
  C_AD
};

const uint16_t PROGMEM combo_AD[] = {KC_A, KC_D, COMBO_END};

combo_t key_combos[] = {
  [C_AD] = COMBO(combo_AD, KC_X),
};

I cannot get the combo to release if only A or D is released using process_combo_key_release from the docs. It will release only once both A and D have been released.

This is what I have tried:

bool process_combo_key_release(uint16_t combo_index, combo_t *combo, uint8_t key_index, uint16_t keycode) {
    return true;
}

as well as:

bool process_combo_key_release(uint16_t combo_index, combo_t *combo, uint8_t key_index, uint16_t keycode) {
    switch (combo_index) {
        case C_AD:
            switch(keycode) {
                case KC_A:
                    unregister_code(KC_X);
                    break;
                case KC_D:
                    unregister_code(KC_X);
                    break;
            }
            return true; //release combo
    }
    return false;
}

Keyboard Used

royal_kludge/rk61

Link to product page (if applicable)

No response

Operating System

No response

qmk doctor Output

Is AutoHotKey / Karabiner installed

• AutoHotKey (Windows)
• Karabiner (macOS)

Other keyboard-related software installed

No response

Additional Context

No response