Hi, Just got my first BLU Door/Window and I’ve got the same issue - intermittent update of the opening/closing sensor.
Fortunately I’ve got a Shelly Mini1PMG3 near by so I added the BLU door/window as a BTHome component to it, then created an action which calls a HA web hook when the door opens.
My plan B was to see if I could trigger my HA automation on any state change for any of the device entities, given that the Illuminance and rotation entities do always update, even when the open/close does not.