This assertion should be fixed by upstream commit 8f695676227 "Avoid assertion in check_interrupts_property()". That should be included in dtc v1.5.1 which I hope to release soon.
This assertion should be fixed by upstream commit 8f695676227 "Avoid assertion in check_interrupt s_property( )". That should be included in dtc v1.5.1 which I hope to release soon.