animation goes into T-pose in SE Skyrim

[Embium2]

I transferred keyframes from skeleton of another game using the auto rig script in Blender onto skyrim XP32 skeleton. I assigned keyframes to all the bones correctly and preserved all marks, such as for example NiControllerSequence or pynActionSlots in object properties and other that i found. Simply put, I did everything the same as in the original animations loaded using the pynifly plugin. But when I exporting, converting it to SE format and loading it in game, the character moves up and down, but in a T-pose. Where could be the problem here?

p.s. To convert to the SE format, I used both hkxcmd and HavokBehaviorPostProcess. Both options produced the same result.

[Embium2]

A small add: besides the T-pose, the animation retains the NPC COM XYZ movements by keyframe offset, but all other keyframes remain empty only with first one frame. Re-importing into Blender clearly shows this.

[BadDogSkyrim]

Anything in the console log?