Odd-Eye Belisha Support and Mana Deflector

You say you've tested it on a mob with Mana Deflector and a mob with high protection, but have you actually tested it on an invulnerable mob? Protection/Damage Reduction =/= Invulnerability.

Tested on an Amethyst Magic Golem - She does not penetrate invulnerability. Using her lands 5 total damage and prompts the typical "This weapon isn't making any impact" message each time she hits.

Could I please see some evidence of your claims and/or more eyewitness testimony? Because I've heard otherwise (or maybe I'm mistaken for the Yui puppet).

You must be mistaken. [1]

Yui puppet is the one that ignores everything. When Belisha puppets were new, there were assumptions that it was just a reskin to the Yui puppet so people believed its action would have the same effects as Yui's action.