Debug chunk borders are not shown if debug info is set to reduced

Can confirm. This only happens when debug info is set to reduced, I edited the ticket appropriately. This might be intentional.

Analysed by using yarn's map for 1.15.1 Pre-release 1, this is intended:

net/minecraft/client/render/debug/DebugRenderer#render

if (this.showChunkBorder && !MinecraftClient.getInstance().hasReducedDebugInfo()) {
    this.chunkBorderDebugRenderer.render(matrices, vertexConsumers, cameraX, cameraY, cameraZ);
}