"Woven Flesh" Drop

I’m not sure if this is the right section to post this, but I’m genuinely starting to suspect a bug.

So I’ve been trying to get “Woven Flesh” from Abomination.
Abomination has 2 mandatory unique drops.
1 Woven Flesh (chest).
2 Blood Ribbons (ring).

According to the loot tables, each unique has a 50% chance of dropping.
So everytime you kill Abomination, it’s a 50/50 coin flip between getting the ring or the chest.

Well, I’ve killed Abomination over 10 times now, and have ONLY ever dropped the ring. Imagine flipping a coin, and getting heads 10 times in a row.
The odds of that happening are statistically microscopic: we’re talking 1 in 1024.
There’s bad RNG, and then there’s whatever this bs is.

So, devs, my question is this: am I missing something?
Is there some hidden prerequisite to dropping “Woven Flesh”, that I haven’t fulfilled yet? Maybe it’s because I’m still doing low level monoliths, and haven’t even unlocked base Aberroth yet?
Just, what is going on here?