1.41 GB not mounted since oclp/sonoma installation

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https://preview.redd.it/c6xak5rzqfwc1.jpg?width=1878&format=pjpg&auto=webp&s=3e4fbf67217af633f4267557aecd16500275694d

I was checking my disks after the successful installation oclp 1.4.3/Sonoma 1.4.1 on a MBP 14,3 2017 with Touch Bar.

Why I have an Not Mounted volume on my main (startup) disk?
I googled for this situation, I have found the question reported but without answer. Can Someone explain, please?

Thanks.

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