"Dazed" slow not movement impairing?

I was running Stockades a few times earlier as a Druid tank; and I noticed that me shapeshifting wasn’t cleansing me of the Dazed debuff (-50% movement speed). Other slows are cleared from personal experience and from what my guild had told me, but not this slow. I tried chugging a Free Action Potion before a big pull, and I was still getting constantly Dazed even while under the effects which were supposed to prevent all movement impairments. Is Dazed intentionally NOT registered as a movement impairment, or is this merely a bug?

working as intended