I thought the issue was the threaded insert coming loose in the top hose rather than the screw itself.
I'd guess at least part of the problem is over tightening of the bleed screw causing the insert to tear free of the hose. It only really needs to be done up finger tight to prevent leakage, but the slot encourages tightening with a screwdriver. If you have a brass or stainless screw with a slot the temptation to over tighten is going to be even greater.

