Terrain bug: basemap labels bleed over an overlying raster

An opaque raster layer (Esri Wayback imagery, 2014-02-20) is added above every layer of a vector basemap (OpenFreeMap Liberty), with raster-dem terrain enabled. View ~zoom 17.

Terrain: on
Toggle terrain Toggle imagery Fly to White House

With terrain ON, the basemap's symbol labels (e.g. "White House", "The West Wing", "West Colonnade") render on top of the imagery, even though the imagery layer sits above them in the style. Toggle terrain OFF and the imagery correctly hides the labels. The labels only bleed at high zoom (~z16+).