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.

Hello,
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
https://developer-blender-org.translate.goog/T89621?_x_tr_sl=en&_x_tr_tl=ru&_x_tr_hl=ru&_x_tr_pto=wapp

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