Signs with glowing letters "blackens" all non-blocks and block entities

When applying a Glow Ink Sac to a written sign, every block entity and non-block becomes “blackened”.

This issue will persist as long as there’s no nearby entities, as otherwise everything will render as normal.

Also somewhat related: Non-blocks and block entities in general occasionally flicker to “black” at random, may be epileptic.

1.) Place a sign In an area full of similar blocks
2.) Write text on the sign
3.) Apply a Glow Ink Sac to the sign
4.) *All surrounding non-blocks and block entities, as well as the sign itself, should be rendered "black"
5.) Remove the offending sign to revert to normal

*If other entities are within the player's viewing range (not necessarily visible), and as long as both the player and the entity are close by, then everything will render "normal"
**Item entities are affected by the "blacken" but not mobs or mounts