Constrains not working correct when put on ik hand .L and .R bone at same time

[Radeonoff]

i need both hands to stay at chest position and keep pose during the animation, so i put “child of” or “copy location” constrain on both ik hands and pointing another arm bones as targets, so hands now should follow this bones. thing is, its only working when i put constrain on one hand (no matter .L or .R), when i put constrain on the other hand, it working incorrectly. first its starts move with big delay and then changing its position randomly.

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[Radeonoff]

Blend file here

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[Radeonoff]

upd. both hands work ok if i put other bones except arm ones as constrain targets

[Alessandro Padovani]

You may want to check for warnings in the console, probably there are loops. I doubt you can refer to ik bones as targets, you may refer to spine bones instead that are out of the ik chain.

If there’s nothing to add please close as invalid, this is not a bug.