Vehicle becomes transparent when moving around or when opening/close a vehicle door

[akirashirosawa]

Describe the bug

Vehicle becomes transparent (character can see through heavy duty boards or regular boards) when moving around or when opening/close a door of it or of another vehicle. It's not only cosmetic issue: character can see zombie, and zombie can see character too through vehicle with boards. Please look at the screenshots.

Steps To Reproduce

1. Move around some heavy vehicle with boards - in some position character can see through it.
2. Open or close vehicle door make vehicle transparent - character can see through it.

Expected behavior

Character and monsters can't see through heavy duty or regular boards of vehicle.

Screenshots

Moving around:

Open then close door inside the vehicle

Open door of nearby vehicle

Versions and configuration

• OS: MacOs
  • OS Version: Name: Mac OS X; Version: 10.15.3; Build: 19D76;
• Game Version: 0.D-13031-g5a76e8e30d [64-bit]
• Graphics Version: Tiles
• Mods loaded: [
  Dark Days Ahead [dda],
  Disable NPC Needs [no_npc_food],
  No Rail Stations [No_Rail_Stations]
  ]

Additional context

This issue is not related to map memory fix on #37460, I checked it when fix vehicle drag bug. This issue occurred somewhere later.

[akirashirosawa]

This issue is noticeable in game only when the zlevels off. But transparency cache building broken after #38280. See fix #38712.