The temporary solution is to either install the proxmox kernel or roll back to 5.9. Both can be done relatively easily and safely using the OMV-Extras plugin.
Edit: Just noticed you said you recently reinstalled OMV. I'm not sure if the download image was updated with the 5.10 kernel. If it wasn't and you updated after installing, your system should still have a copy of the 5.9 kernel.