Batched entity rendering causes Powah reactor to become translucent

[embeddedt]

What happened?

To reproduce:

1. On NeoForge (I used 21.1.84), install Iris 1.8.1, Powah 6.1.6, Industrial Foregoing 1.21-3.6.22 (and associated dependencies).
2. Open the following world: reactor_sorting_issue.zip
3. Observe that stained glass and the IF working area visual both render through the reactor.

Disabling the working area on the IF machine (can be done on the central right portion of its GUI) makes the reactor correctly occlude geometry behind it.

This issue can be observed without a shader enabled, but not if Iris is completely removed, so I suspect it's an issue with the batched entity rendering optimization.

Screenshots

Log output

No response

Minecraft Version

Minecraft 1.21.1

Iris Version

1.8.1

Operating System

Arch Linux

What is your GPU?

RX 6600

Additional context

The working area and reactor both appear to render as block entities using a typical BlockEntityRenderer that writes into a buffer provided by the MultiBufferSource. The issue seems dependent on the order in which they render, so their placement relative to one another in the chunk section is important.

Powah's BER: https://github.com/Technici4n/Powah/blob/1.21.1/src/main/java/owmii/powah/client/render/tile/ReactorRenderer.java
IF's BER: https://github.com/InnovativeOnlineIndustries/Industrial-Foregoing/blob/1.21/src/main/java/com/buuz135/industrial/proxy/client/render/WorkingAreaTESR.java