UDP port stays open even after program dies

Number:rdar://FB8923001 Date Originated:1 Dec 2020
Status: Resolved:
Product:macOS Product Version:10.15.7 (19H15)
Classification: Reproducible:always
UDP ports can stay open indefinitely even after the application that opened them dies. 
This happens reliably with the Nimbus application. See bug report at https://github.com/status-im/nimbus-eth2/issues/2048 .
Relatedly, see https://stackoverflow.com/questions/40512274/release-udp-port-used-by-dead-process-on-os-x .


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