For a user version Pixel/Nexus, you may not have the permission to pull out /data/misc/bluetooth/logs/btsnoop_hci.log. You can get the hci log like this:adb shell dumpsys bluetooth_manager
adb bugreport > BUG_REPORT.txt
You will get a BUG_REPORT.txt and zip file. HCI log will be found under FS\data\misc\bluetooth\logs of the zip file