Ubuntu Linux entry missing in OpenCore 0.7.0 menu in a Multiboot System with separate drives

Hi All,
in order to install macOS Big Sur in a dedicated APFS volume on my multiboot system (WIN-macOS-Linux) on separate drives (UEFI-Mode), it was necessary to switch from Clover to OpenCore. So I created the USB pendrive for Big Sur install using OpenCore 0.7.0. Before installing Big Sur, I wanted to test OpenCore on my current multiboot system and I realized that while the Windows 10 entry appears in the OpenCore menu (and it seems to boot fine), the Ubuntu Linux entry does not appear...

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