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Big Sur entry disappears from Boot Menu

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OpenCore 0.63

Have updated Catalina to Big Sur without any problems. In the boot-menu appeared the entry “Big Sur”. Could choose the entry and start Big Sur – everything worked perfect. Two days later instead of the entry “Bis Sur” in the boot menu appeared suddenly the entry “Big Sur - Data”. Impossible to start OS.

Have deleted everything and installed the Big Sur anew. The same story – it worked about two days, then again “Big Sur – Data” instead of “Big Sur”. Impossible to start. In these two days I didn’t install any software or changed any kexts. I had never such problems with Catalina. Any ideas? Thank you.

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