After some researching in the FabricMC Discord server (thanks to Soren for the fix), enabling depth testing before drawing the icon seems to fix this bug.
The icon is drawn in AdvancementTabType.drawIcon(), which is called by AdvancementTreeWidget.drawIcon(). Wrapping the call in AdvancementTreeWidget with GlStateManager.enableDepthTest() and GlStateManager.disableDepthTest() fixed the bug.
Juuz
After some researching in the FabricMC Discord server (thanks to Soren for the fix), enabling depth testing before drawing the icon seems to fix this bug.
The icon is drawn in
AdvancementTabType.drawIcon(), which is called byAdvancementTreeWidget.drawIcon(). Wrapping the call inAdvancementTreeWidgetwithGlStateManager.enableDepthTest()andGlStateManager.disableDepthTest()fixed the bug.(Using Yarn mappings, version 1.14.4+build.2)
Yarn
1.14.4
AdvancementTreeWidget.drawIcon(int, int, ItemRenderer)dcv.a(int, int, dsv)AdvancementTabType.drawIcon(int, int, int, ItemRenderer, ItemStack)dcw.a(int, int, int, dsv, bcj)