We raided for 2 hours today and nobody complained about block issues.
The repro that people are talking about today is a bit contrived--you generally don't sheathe your weapons in combat, and as people often cast skills to prebuff before combat, people generally don't start combat by light-attacking to unsheathe.
It's a scenario that I imagine most people will never run into in actual gameplay. And the only reason we're seeing it is because it was being used to reliably replicate the more serious form of the bug that is indeed gone after today.
It's fine. Try it in actual gameplay rather than a contrived set of repro steps; the bug that existed before today was legitimately bad since it could happen in actual combat from just bar swapping. The issue people are talking about today is nothing like that.