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@M_V
Then it should be an easy job of identifying what is moving and what's not when you put some pressure on the crank.
Crank moves but chainring doesnt = interface between crank and chainring at fault
Crank and chainring move but chain doesnt = worn chainring or chain
Crank, chainring and chain move but rear sprocket doesnt = rear sprocket worn
Everything moves except the wheel = rearsprocket and/or lockring are loose.
For what it's worth id put good money on it being the 1st.