It's a good plan: keep it a secret until you see if it accidentally/magically gets fixed before giving the devs something concrete they can actually be working on right now.
Here's the skinny: none of the devs are aware of any fatal flaws in 0.72f. If they were, they'd be working on them. So if you HAVE discovered one, the chance that any of the latest PROPOSED changes would accidentally fix that fatal flaw (that no one was aware of in the first place) is slim to none. In short... you're only holding up any potential fix for your issue even longer.