Maybe some undefined behaviour here: https://searchfox.org/mozilla-central/rev/97feebcab27f1a92e70ceacaa77211e9eaba0e6e/gfx/2d/ConicGradientEffectD2D1.cpp#308?
Bug 1851963 Comment 15 Edit History
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Maybe some undefined behaviour in this function: https://searchfox.org/mozilla-central/rev/97feebcab27f1a92e70ceacaa77211e9eaba0e6e/gfx/2d/ConicGradientEffectD2D1.cpp#308?