September 11, 2020 4:36 EDT AM
Try reinstalling MacOS via internet recovery. Startup with command-R and follow the onscreen instructions to invoke a reinstall of MacOS. That might do it.
You may also want to read up on the matter since you are facing this issue. Perhaps there are clues here that can help beyond my one step. https://eclecticlight.co/2018/08/01/disks-partitions-volumes-containers/
I will find some more links for you:
https://www.macobserver.com/tips/quick-tip/macos-removing-windows-efi-boot-entry/ - not sure if related to your situation
http://osxdaily.com/2016/07/28/fix-broken-efi-partition-mac/ - old
EFI should come back with a MacOS reinstall.
As for erasing the MSDOS entries, I would think you could use disk utility to reformat those as HFS extended GUID or APFS depending on drive and then merge the partitions - back up before doing this though. Although, it might be the case that a partition made with Boot Camp Assistant can only be removed by the Boot Camp Assistant.
You might want to try the boot camp forum over at Apple, your issue is fairly specific and with the info you offered and my knowledge set being subpar on the topic you may want to consult there: https://discussions.apple.com/search?q=boot+camp
Hop all this verbiage helps.
This post was modified 4 months ago by Alex Santos