Light passes through test instance blocks.
How to reproduce:
On the surface, during daytime, enclose yourself in a single layer of solid blocks, so that there is no light at your position.
Replace one of the enclosure's blocks with a test instance block.
→ ❌ The sun now lights the inside of the enclosure.
Expected result:
Light wouldn't be able to pass through test instance blocks.
Observed result:
Light can pass through test instance blocks.
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Comments 2
Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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I can confirm this issue. Relates to MC-279499 as they have the same root cause (being marked as non-opaque in the block settings). I assume the block is implemented this way to make the beacon beam behavior simpler.