Lightleak-esque artifacts with lanterns in FastPBR

[0CCULTIST]

Describe the bug
Non-soul lanterns produce lighting issues reminiscent of lightleaking in the shadowmap

Screenshots

Additional context
This also occurs in Bliss shader when using floodfill lighting. Hardcoded emission issue maybe?
Ushader & Nostalgia don't produce this behavior

[0CCULTIST]

Also happens with VanillaPlus

[rre36]

Do you have directional lightmaps enabled?

[0CCULTIST]

Do you have directional lightmaps enabled?

Happens with default settings so it's whatever the default is.
Also I have no LabPBR pack in case that's relevant.