Help! Dual boot, not seeing OCLP Sequoia volume

Help! Dual boot, not seeing OCLP Sequoia volume
  • I've got a Mid 2012 Macbook 15 that I configured as dual boot with Mojave (volume name "OldOS") and Sequoia ("NewOS"). Both are APFS Volumes in a 1TB container.
  • I installed Davinci Resolve (DR) for video editing. (Turned out to be overkill for my needs.)
  • Shortly after, while trying to do color correction of images in the Preview app I noticed the "Adjust Color" window failed to show the color curves at the top of the window, and if I tried to make any adjustments in the dialog it would grey out the image. Installing DR broke it.
  • I uninstalled DR, but that' didn't fix it, so I thought maybe it was a conflict between DR and OCLP. Maybe Re-applying Root patches would fix it.
  • I opened OCLP and clicked Post-Install Root Patch. It ran for a while then froze the system. No scrolling in the Patch window, no keyboard or mouse response. (I unfortunately didn't record what patch it was on when it froze.) I left it alone for an hour or so with no change, so power cycled.
  • Now the system doesn't give me the option to boot to the "NewOS" Sequoia volume. When I boot into Mojave, the I see "/Volumes/NewOS - Data - Data" mounted and I can browse it.
  • Here's what Disk Utility shows. (That "Update" volume is suspicious....):

https://preview.redd.it/7qlcwao0tt6g1.png?width=882&format=png&auto=webp&s=47212b5e4b00543395cc8be2ad2883ef6df07473

Can someone advise me on how to get the system to recognize the OCLP Sequoia volume as a boot option?

submitted by /u/Alone-Implement-1908
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