The wither's dash, which can normally destroy every breakable block in the game, including netherite, is not able to destroy obsidian.
For further context of the video, I used command blocks to massively increase my strength and resistance for the sake of the video, and I also used the command blocks to kill wither skulls to prevent them from affecting the experiment.
The resource pack used merely changes textures for aesthetic reasons. It does not affect gameplay.
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I believe this is because when they made the “change to the “spawn explosion breaking obsidian” they just changed the wither’s block breaking attack, which is also what the dash is just horizontally moved with the wither, because the block breaking attack appears to happen upon initial spawn even when the wither isn’t damaged.