[1.15.2 pre16] Sunlight bug underground with any shaders (with BiomsOPlenty)

[minecraft20202020]

Description of Issue

Any shaders gives sunlight underground - only if Bioms-o-Plenty was installed.

Steps to Reproduce

1. Go underground (10-15 blocks over bedrock blocks).
2. Enter to console /time set day in creative mode.

OptiFine Version

1.15.2 pre16

Installation Method

Drop the JAR file into "mods" folder.

Fabric/Forge Version

forge-1.15.2-31.1.77

Other Installed Mods

BiomesOPlenty-1.15.2-10.0.0.358-universal

Prior Testing

If you've installed standalone:

• Does this happen in Vanilla without OptiFine? NO.

If you've installed using Forge/Fabric:

• Does this happen without other mods installed? NO. Only BiomesOPlenty-1.15.2-10.0.0.358-universal mod installed.

Additional Information

https://www.curseforge.com/minecraft/mc-mods/biomes-o-plenty/files/2948070 : "Added block.properties for shader support (Doesn't seem to be working though? OptiFine might not have re-added support yet)"

[shatteredhalo]

Having this same issue.

[ghost]

still occurs (pre-22)