Map track colour bug in activities

I have an issue where (although set in system and individual app settings), the map track colour doesn't appear in the set colour. I track a lot of activities in water, so have set the colour to red. Looking back at any activities, the track is still the same nearly water blue colour - i.e. almost invisible.

Does anyone else see this? I contacted Garmin support, but they kept me waiting 30 minutes then suggested a master reset (i'd already done in advance to rule that out).