My recollection is that actual stuns (i.e. from a spell or a weapon proc or a bash/stun via melee) would interrupt you through a Rune.
But plain old melee (slash, stab, crush, punch) couldn't interrupt through a Rune.
If you got interrupted with Rune on, then you should check the log to see what the attack was that did it. If it was just plain old melee, then that might indeed be a bug.
Hopefully others know what it was in classic with more certainty than I.
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