Read Out Protection - Target does not run after setting Level 1

With STM32CubeProgrammer, I download a .hex file to my target, and it runs.

Then I go to the "OB" Tab, select "BB" (Level 1) and press "Apply". After this the target does no longer run, also not after a power cycle.

To make it working again, I first select "AA" (Level 0) and reprogram the target.

What am I doing wrong? Or can't I protect the chip for read-out at all?

The Target is an STM32H753.

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