FAIL! : tst_qtgraphicaleffects::dropShadow() Compared doubles are not the same (fuzzy compare)
Actual (obj->property("radius").toDouble()): 4
Expected (0.0) : 0
Loc: [/usr/src/debug/qtgraphicaleffects/6.2.0-r0/git/tests/auto/tst_qtgraphicaleffects.cpp(402)]

This happens because webOS uses old version of qtgraphicaleffects (the one which existed before removing it from meta-qt6 yocto layer) and webOS seems to have patched that to use a different kind of drop shadow by default.