Bendy bones problem blender 3.0 -> 2.9

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Hello! Maybe someone knows how to solve this problem. When transferring a rig from a scene saved by blender 3.0 to blender 2.9, bones with segments break. Displayed as B-Bone.

This is normal, there has been some drastic changes in 3.0 regarding Bendy Bones and that may cause some breaks when opening a 3.0 file with an older Blender.

yes this is my situation

accidentally saved the scene from the new version 3.0. Well, I’ll have to go back and repeat the steps,
because need file in old version of blender 2.9