Kscan sideband crashes on initialisation with endpoint and Bluetooth macros on battery power

[ReFil]

With a board on battery power, a power on event with a kscan sideband behaviour being triggered immediately upon power on e.g. a toggle switch can cause crashes if the sideband is configured with Bluetooth behaviours. CONFIG_KSCAN_SIDEBAND_INIT_PRIORITY=99 doesn't make a difference. The crashing doesn't occur if the sideband triggers &none behaviours. The crashing also doesn't occur if USB is present on power on

Example sideband configuration

macros {
    ZMK_MACRO(usb_conn,
        wait-ms = <1>;
        tap-ms = <1>;
        bindings = <&out OUT_USB>;
    )
    ZMK_MACRO(ble_zero,
        wait-ms = <1>;
        tap-ms = <1>;
        bindings = <&out OUT_BLE &bt BT_SEL 0>;
    )
    ZMK_MACRO(ble_one,
        wait-ms = <1>;
        tap-ms = <1>;
        bindings = <&out OUT_BLE &bt BT_SEL 1>;
    )
    #include "version.dtsi"
};

endpoint_sideband_behaviors {
    auto-enable;
    compatible = "zmk,kscan-sideband-behaviors";
    kscan = <&kscan_sp3t_toggle>;

    first_toggle_sideband: first_toggle_sideband {
        column = <0>;
        bindings = <&usb_conn>;
    };

    second_toggle_sideband: second_toggle_sideband {
        column = <1>;
        bindings = <&ble_zero>;
    };

    third_toggle_sideband: third_toggle_sideband {
        column = <2>;
        bindings = <&ble_one>;
    };
};