aw :( thanks for letting us know though. Although how is it broken?
Edit: no It's not broken I used it just fine, just put it in mod_overrides

@JairShotGG It does appear to sometimes not work, (i've seen it not work several times with a grin mask, but that could just be my mods

I think the person in question is referring to a mask.
you can just add it by replacing the file name "helmet" with a "mask" (ex. helmet_equip.animation > mask_equip.animation)

there is also a "glasses" type of mask but I don't think the animation fits with this type of animation.