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ChmodBPF "Permission denied" on MacOS 10.15.4 Catalina

Wireshark 3.2.3 reports instead that I should "install ChmodBPF to fix this" but that doesn't work and is already installed. The executable gives up after 255 tries with:

/Library/Application\ Support/Wireshark/ChmodBPF/ChmodBPF ; exit; /Library/Application Support/Wireshark/ChmodBPF/ChmodBPF: line 35: /dev/bpf0: Permission denied

Then another 255 tries to:

chgrp: /dev/bpf0: Operation not permitted