I notice when I was making custom emotes and I would Use "move right_arm_off_x 100 -1" It will also move the other player arm, Ik that everyone going to be saying it doesn't do that in the latest version
But I am using 1.12.2 r1.4-124 because it the only version of 1.12.2 that still has "/emote command"
If their is no fix, can you consider adding back /emote to the latest version
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Example
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https://gyazo.com/6738726fe88e521d91db09a2833d5517

Thanks for you time this is very important to me

Can't really help you with 1.12, sorry.