Why does the filter O-ring blow out?
The O-ring is designed to dislodge when the differential pressure across the filter reaches 30 to 40 psid (2.1 to 2.8 bar). This is to protect the filter from rupturing. The O-ring is glued on for installation purposes. The glue is designed to dissolve from the oil and refrigerant. So it may not have blown out it, is just laying there when you remove the filter.
