Villagers'/ Witchs' right arm doesn't have the texture flipped. (Like zombies/giants/players/zombie pigmen/zombie villagers/Illagers' does.)

Confirmed.

Daniel "Glampkoo", Im not english so I can't fully english, and why I am saying this is because I forgot what confirm means, please comment what it means

It means yes or true

Okay, this showed up for me when I were creating a "Villager with Iron Amor" texture, I couldnt get the texture right without ruining it.

Confirmed.
This is still apparent in 1.6.2

This is still a problem in 1.10.2.

Please re-open the report and slap a dev in to action 😛

Reopened, added the affected version, and made you reporter.

Sill a bug in 1.11

Example of the arm messed up in PureBD Evoker Illager attached for clarity (and hopefully to poke a dev to fix it >.< )

So 17w16a/b seems to have fixed the arms of the Illagers, but Villagers and Witches are still broken.