Maps don't display when opening app while offline

Am on v6.3.14
Downloaded projects do not display maps when opening Trap.NZ while offline. It seems to be related to it dropping the hi-res zoom limit to 1/21 when opening the app offline but not sure why it does this?

  1. Whilst online the map settings show as hi-res limit = 15/21

  2. If go into airplane mode while the app is closed, offline the map settings shows as hi-res limit = 1/21

  3. and it displays a blank map with the traps in position

  4. If I turn airplane mode off then I have to refresh the map tiles in order to see the map.