Chainring bolts or interface between chainring and crank.
I had this recently on a bike were I'd painted the cranks and there was some flaky paint under the chainring, cleaned off, noise sorted.
Also had it on another bike not so long ago, tightened all chainring nuts and bolts (some of which were stupidly loose) and noise sorted.
@M_V started
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Chainring bolts or interface between chainring and crank.
I had this recently on a bike were I'd painted the cranks and there was some flaky paint under the chainring, cleaned off, noise sorted.
Also had it on another bike not so long ago, tightened all chainring nuts and bolts (some of which were stupidly loose) and noise sorted.