I’ve witnessed this a few times, but I think I have confirmed it with a recent match.
General issue: a countdown tile counts down twice in the same turn because it is moved after it counts down the first time.
Example board layout:
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The countdown tile in the top right counts down from 2 to 1, then the countdown tile below it counts down from 1 to 0, goes off, and destroys the surrounding red tiles. Without matches, this places the top right countdown tile where the trap tile is located. Then, the tile counts down from 1 to 0, and goes off, dealing damage.
So in this example, the top right countdown tile has counted down twice in the same turn. This should not happen. Can you please verify this and let me know when it might be corrected? Thanks!