Unlikely front and rear indicator bulbs would have both blown. I guess the reduced load on right hand circuit might have inhibited the flasher unit though. If you can, check if front or rear give a brief flash when first selecting right indicators. The one that doesn't will be the bulb to check/replace.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone