Originally Posted by
jackb
I neglected to notice that I threaded the chain on top of the tab instead of under it. I rethreaded it correctly and now the crank turns smoothly without the problem noise. Thanks to all of you for getting me on the right track. I must have examined that darn derailleur a half dozen times and never noticed the problem.
I think probably most of us have done something like that at one point or another. It is usually little things that cause great problems but are easy to fix. Routing issue, QR skewer not properly installed, missing a magnet (for some e-bikes and their speed sensors), a spacer is missing something like that.