What can I do to make the hand hold the grip of the gun even while the character is bending downward or upward?

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I don’t see a problem in the hierarchy.
This is the animation blueprint where I have set up these:

I thought this was happening due to me not setting the position of the Hand L Goal Position correctly based on the target socket in the character blueprint, but I tried setting that position directly in the IK Rig and the same problem happened.