PR #885 introduced a regression:

• flight tracks are unexpectedly clampedToGround

state before PR#885 == expected result
https://sys-map.dev.bgdi.ch/preview/bug_pb-562_wrong_external_kml_style/index.html#/map?sr=3857&center=802000,5970370&camera=7.204872,47.173075,1477,-5,51,&z=17&3d&bgLayer=ch.swisstopo.swisstlm3d-karte-farbe_3d&layers=KML%7C208_Weissenstein_20_07_2024.kml

state after PR#885 == actual result
https://sys-map.dev.bgdi.ch/preview/bug_pb-591_3d_kml_improvments/index.html#/map?sr=3857&center=802000,5970370&camera=7.204872,47.173075,1477,-5,51,&z=17&3d&bgLayer=ch.swisstopo.swisstlm3d-karte-farbe_3d&layers=KML%7C208_Weissenstein_20_07_2024.kml

unfortunately theese two overrides ignore existing KML settings like <altitudeMode>absolute</altitudeMode> and opacity

while clampToGround may make a lot of sense in some cases - for polylines it's not generally applicable ;-)

nb: does cesium parse altitudeMode well enough, doesn't it?