Why interrupts not occur under debug when RDP switched to level 1?

WIth oocd I try to do following steps:

1) Send reset and halt command

2) disable bit DHCSR.C_MASKINTS

3) Enable interrupts into ISER reg

4) Make any interrupt pending in ISPR reg

5) Perform Step command

if readout protection is diasabled, core interrupt occurs, I can see that pending bit is reset.

if readout protection set to 1, pending bit still set even if I will send Resume command for few seconds.

So, if there are any connection between RDP and interrupts mechanics, where can I read about it?

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