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Did you:

1. Close ALL Chrome windows before starting the capture?
2. Start Chrome from the terminal window where you set the SSLKEYLOGFILE environment variable?

If you select the packet with the encrypted Application Data, and then apply the filter tcp.stream==${tcp.stream}, do you see the full TLS handshake? Does the handshake show a "Finished" from both sides or does it show "encrypted handshake" message from both sides?

If you want to check if the functionality actually works, you can download a trace of mine from https://www.cloudshark.org/captures/1cd191698a5c and you will find the TLS session key in the capture file comments (see: capture file properties).