It's more than just those specific stuns. I bug reported this issue almost a year ago I think lol
After the duration of the shorter stun that overwrote the longer stun wears off, the remaining timer of the longer stun will still prevent players from casting, it however does nothing to NPCs who seem immune to this mechanic.
You'll notice it with mobs that stun often. The buff icon for a mez for instance will be long gone, but the stun effect lasts longer and prevents you from casting.
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