Graticule interval does not reset when zooming out if extent is set

[mike-000]

Describe the bug
The graticule interval does not reset correctly when zooming out if an extent is set.

To Reproduce
Set an extent on the Map Graticule example so only the 5 and 10 degrees meridians and 45 and 50 degree parallels are visible https://codesandbox.io/s/graticule-forked-fhqdpt?file=/main.js Zoom in until more lines are visible at 2 and then 1 degree intervals. Then zoom out again - the interval remains at 2 degrees.

Expected behavior
The extent should not affect the interval which should depend only on resolution, and interval should be the same whether the resolution is reached by zooming or in by zooming out.