Changing zoom value when using 3D terrain leads to layers jittering

mapbox-gl-js version: Version used in studio.mapbox.com

browser: Google Chrome (newest version)

Steps to Trigger Behavior

1. Create map style in Mapbox Studio with 3D terrain enabled (
2. Zoom map to some mountains (with a zoom value where some layers change their properties)
3. Drag the map away form the mountain and back to the mountain
4. Notice the zoom level changing just by dragging the map
5. Notice the layer presentation change between lower and higher detail

Link to Demonstration

https://media.giphy.com/media/Mr224WIgAEzS4XYgX9/giphy-downsized-large.gif

Expected Behavior

When dragging the map the layer appearance should not change.
Wouldn't it make sense that the zoom level is not affected by the terrain height at the current viewpoiont? The zoom level could be calculated on sea level or at least from a very basic height information where all "sudden" height changes like mountains are averaged out.
This way the layers would not jump between their lower and higher detail views. This would lead to a clean presentation without jitter.

Actual Behavior

When dragging the map the layers are affected by the zoom value change and therefore change their appearance. This leads to jitter when dragging the map over the threshold multiple times.

Reproduce the issue with a Mapbox Studio style using 3D terrain, then drag the map away from and back toward mountains while watching the zoom and layer detail changes. Compare the observed jitter with the expected stable layer appearance; done means dragging no longer causes layers to cross detail thresholds unexpectedly.