The Mage trinket ‘Ashtongue Talisman of Insight’ (Item ID: 32488) seems to not work as intended.
While spamming arcane blast the proc of this trinket does not affect the consecutive spellqueued cast.
Log confirming this behaviour(viewable on warcraftlogs):
AWrzdgPfZNyQ9p7v
Youtube Video from OG TBC:
www.youtube. com/watch?v=dmUVs3VJn1w
In this youtube video there is evidence of it affecting consecutive arcane blasts.
At 3:59, for example, a 2.5 second cast time Arcane Blast is cast that procs the buff ‘Insight of the Ashtongue’. The following cast is a 2.0 second cast time arcane blast, so with 1 stack of the Arcane Blast debuff up (0.3 seconds cast time reduction) the only haste buff that could result in a 2.0 second cast time is the before mentioned proc from the trinket in question.
The game is different now with spellqueue actually being a thing but I am certain this trinkets current behaviour does not seem to be in line with how it was intended to function in The Burning Crusade.
The current behaviour effectively wastes 1.5 seconds of the already small 5 second proc of this trinket and makes it substantially worse.
Confirmed not a bug at this point