Can't get past login screen after first cold start

After upgrading from HS to Mojave I've been experiencing this issue: stuck at login screen after cold start with the power button. No keyboard/mouse input (at Clover 5099 OS selection menu - macOS/Win - everything works fine). After hard reset (that is, pressing the RESET button) the login screen might work OK, might not. In this case I'de have to repeat the RESET procedure 3-4 times before I could login properly.

Same might happen at random after system restart: either stuck at login after...

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