Please re-word your post.
You are wrong in saying the problem is melee auto attack.
The problem is feign death. The delay in feign death causes other things to cause feign to fail. You are just isolating other variables to work around the problem, but not actually address the problem. It’s just the same as you telling people to do petpassive. It’s not actually fixing any problems, it’s just pet attacking will cause feign to fail because it can cause aggro in the delay it takes feign to work. Attack does the same. Don’t confuse a work around to the bug with the bug itself.
70% of the time working is not working. Feign should work 100% of the time, unless it is resisted. I don’t know what acceptance criteria you have where a feature is deemed “working” if it only works 70% of the time.