Problem with PoseStack & Depth test rendering order

[tennox]

I'm working on CustomSelectionBox mod, and encountered a bug where in F5, the box is rendered above the player (it should be behind)

I'm using PoseStack to push and pop a RenderType I create like this (the code is simplified - see full source:

val builder = RenderType.CompositeState.builder()
builder.setShaderState(RenderStateShard.RENDERTYPE_LINES_SHADER)
builder.setLayeringState(RenderStateShard.VIEW_OFFSET_Z_LAYERING)
builder.setTransparencyState(RenderStateShard.TRANSLUCENT_TRANSPARENCY)
builder.setOutputState(RenderStateShard.ITEM_ENTITY_TARGET)
if (config.disableDepthBuffer) builder.setDepthTestState(RenderStateShard.NO_DEPTH_TEST)
builder.setCullState(RenderStateShard.NO_CULL)
val compositeState = builder.createCompositeState(false)
val renderType = RenderType.create(
    "csb-lines",
    DefaultVertexFormat.POSITION_COLOR_NORMAL,
    VertexFormat.Mode.LINES,
    256,
    compositeState
)
val vertexConsumer = bufferSource.getBuffer(renderType)

poseStack.pushPose()
val pose = poseStack.last()
vertexConsumer.vertex(
    pose.pose(),
    //...
)
poseStack.popPose()

I thought this strategy with push and pop should reset all rendering states, but somehow it seems to affect other parts of minecraft rendering :sadcowboy:

Sometimes I got even weirder rendering issues (but those are not easily reproducible, but maybe related):
https://gitlab.com/tennox-mods/CustomSelectionBox/uploads/3fecc1066dfc2496edd73228722619ab/2023-02-24_18.58.08.png

I'd be grateful about any pointer what I might be doing wrong 😅