So you had to remove a workaround for a no longer existent bug from your code. Sounds like an overall win to me. I don't see how you can talk about poor QA when the p5p folks explicitly mention that they're aware that the new code is problematic. Apparently they simply deemed the old code so bad that they preferred to toss out unfinished code for this fix-date release than keep the previous stuff.
At least judging by the amount of investigation to prepare your initial post (none, you just complained "my scripts are broken now" - if you made any debugging attempt you certainly didn't mention it) I'd be more inclined to trust the p5p opinion.
Update: I wasn't saying detach were a workaround per se, just that pg put it in "against his will" as he says because it was necessary.
Makeshifts last the longest.