Something's worn or the chain is too long. Your cassette and derailleur don't know how many chainrings you've got and you would expect them to work at either extreme end of the cassette in either chainring of a 2x set up so chainline is a non issue
Cheers. I'll venture my chain may be too long as all the other bits seem in pretty decent fettle. How's the best way to check?
@Tonts started
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Something's worn or the chain is too long. Your cassette and derailleur don't know how many chainrings you've got and you would expect them to work at either extreme end of the cassette in either chainring of a 2x set up so chainline is a non issue