Project migrate from 5.5 to 5.6

Development Character & Animation
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When opening animations made in 5.5, Unreal 5.6 automatically changes the rotation keyframe values, even without any edits. This results in a different pose.

Manually copying the values per Axis from 5.5 to 5.6 fixes the issue ( too many controllers )— meaning the error lies in the automatic conversion done by the new version. It does that on other then FK controllers, from our initial tests. We tried to export a json with the keys from 5.5 to 5.6, but transfers not working, ex: ( in 5.5 a controller is called : L Arm:IK and in 5.6 L Arm / IK ) also they are not in the same order, so we are scratching a bit our head around this since it’s blocking our animators to keep going on their multiple shots. Also the constraints didn’t follow thru.

HELP!

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Steps to Reproduce
open a project that has a level sequencer in 5.5 that has animation on a modular control rig

switch its version to 5.6

open the same level sequencer and look at both unreal side by side

select a controller and look at its rotation in the curve editor and compare them

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We are discussing this in internal slack channels, two jira’s have been logged and will go into 5.6.1