Not sure if this will help anyone .....
Its been frustrating sometimes when a slight move (accidentally or on purpose!) of a waypoint will lose the info I've put in the name
Sometimes I put '#Petrol - MUST !' or '#LOOK FOR COFFEE'
If for any reason - like putting the waypoint smack bang on the route instead of a few mm to one side - the name and your reminder disappears.
Now, I may have only just joined a party you are all already at but ... I have realised that if, instead of changing the NAME of the waypoint, I press the three little dots icon to get the extended waypoint options - I can add a NOTE to that waypoint. When I move it - name changes - NOTE stays the same.
Thought I would share - !