Problem with creating SubClips when proxy media is generated

I can't normally create and play more than one SubClip from one original clip if it has generated proxy media and option "Use proxy media if available" is activated. Tried on DaVinci Resolve 17 Beta 4 and Beta 5.
My steps:
1. Import clip into DVR17
2. Generate proxy media: right click on Clip - Generate proxy media
3. Activate option "Use proxy media if Available": Menu Playback - Use Proxy Media is Available
4. Create three SubClips from the same Clip by marking in-out marks and Option+B.
5. When I play new created SubClips they are all completely the same although they made from different parts of original Clip. All SubClips are the same as the first created SubClip.
6. When I deactivate option “Use Proxy Media is available” I can normally play and use all my SubClips.
Could anybody help me to solve this problem?
Thanks!
My steps:
1. Import clip into DVR17
2. Generate proxy media: right click on Clip - Generate proxy media
3. Activate option "Use proxy media if Available": Menu Playback - Use Proxy Media is Available
4. Create three SubClips from the same Clip by marking in-out marks and Option+B.
5. When I play new created SubClips they are all completely the same although they made from different parts of original Clip. All SubClips are the same as the first created SubClip.
6. When I deactivate option “Use Proxy Media is available” I can normally play and use all my SubClips.
Could anybody help me to solve this problem?
Thanks!