Anecdata: GRX (810) has been noticeably poor at keeping the chain on the ring on a 1x setup (benchmark was SRAM Force 1 on previous bike).
Strange, I've never had any issues with the ultegra or the RX derailleurs on 1x
How short have you set the chain, I've found that's pretty important to chain retention?
Thats a different mech though isn't it? The uletgra RX was the sweetspot for shimano CX mechanical 1x
GRX is a totally different design
@gofasterstipes started
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Anecdata: GRX (810) has been noticeably poor at keeping the chain on the ring on a 1x setup (benchmark was SRAM Force 1 on previous bike).