Door rattling at the lock for a few seconds before spinning cycle

For months I've been trying to find what makes this rattle sound. Now I've randomly noticed it's the door. I believe this problem appeared after washing an outdoor pillow that, when wet, went over the 9kg load and kept hitting at the door until I stopped the cycle and removed the object.

Any idea if it's the lock/door ensemble or it may be something more related to the tube/spinner/spider ?

This happens only a few seconds, twice on a Mixed Load 1h long program, right about the spinning cycle. On a simple inspection, the tube doesn't seem out of place or lose (grabbing it towards the frame and spinning it around).

SAMSUNG WW90T504DAX