Have a look inside the actual blinker. The light bulb connections to the metal tabs inside may be corroded/ bit dirty and need a bit of cleaning. Happens to mine from time to time.
Agreed with GeorgO,
The clear lens comes off and you can pull the reflective housing out to have a look at the connections behind it if my memory serves me correct on the MY18.
2019 MV Agusta Dragster RR
2017 Aprilia RSV4-RF (SOLD)
2016 Aprilia Tuono Factory (DECEASED)
2015 MV Agusta Dragster RR (SOLD)
2013 Triumph Daytona (SOLD)