Visibility/shadow behaves weirdly around wasp radio towers

[moxian]

Describe the bug

When exploring wasp-infested radio towers, one can see some unexplainable unseen regions. For an example:

The currently viewed tile is "unseen". Presumably because it's too dark there? But if we shift one z-level upwards we'll see that there is just open air above it

so that's confusing.
If we shift even more we will see (Unseen) blob, which is presumably the hive walls.

But

1. why do we not see the walls
2. why does it cast such deep shadow on just one(!) tile below it and
3. why is that deep shadow on the edge of the structe, and not deeper near the center (i.e. why is the tile to the west of the original one "bright"ly lit)?

Attach save file

debug-world-remote-trimmed.tar.gz

This is just a debug world where i spawned the tower in manually, to verify the behavior, but it's the same in "real" game.

Steps to reproduce

find or spawn wasp tower , or load the save
look around, notice the weirdness in the "unseen" tiles

Expected behavior

??
The vision should.. for the lack of better word, make sense? Having an "unseen" tile in the midst of "dark" tiles is perfectly fine, but having it be bordered by "brightly" tiles on all sides is just weird.

Screenshots

No response

Versions and configuration

• OS: Windows
  • OS Version: 10.0.19045.5247 (22H2)
• Game Version: a7c5b6f [64-bit]
• Graphics Version: Tiles
• Game Language: System language []
• Mods loaded: [
  Dark Days Ahead [dda],
  Disable NPC Needs [no_npc_food],
  Portal Storms Ignore NPCs [personal_portal_storms],
  Slowdown Fungal Growth [no_fungal_growth]
  ]

Additional context

Another visibility bug, which is probably unrelated, but i'll mention it still: #78160