I have indications that a couple of witnesses are voting v0.8.2 but have updated to v0.8.4 because they feeled forced to do it since on the github repo it's sais for the v0.8.4:
"All witnesses must upgrade by July 4th."
and the same is not stated for the other versions like v0.8.2 (retroactive),
and nowhere is stated that the network would survive without the bug fix (because the bug fix is not so critical as admitted on slack channel)
So a summary:
Much witnesses updated (or will) to v0.8.4(non retroactive from genesis) because they feel now forced to do it, not because they really not prefer v0.8.2 (retroactive from genesis)
PS of course it is much better you give us the option for a release v0.8.104 (v0.8.2 +bug fix retroactive from genesis) I hope we have it soon enough so witnesses figure out what to do IN TIME) Thanks for your efforts!