copy_from makes zombifies_into impossible to remove via delete

[Karol1223]

Describe the bug

In #61668 I made the smallest dogs not zombify. Or, well, I thought I did. The code is there, it should work. It was such a simple change I didn't even bother to test it. The problem is that now it turns out my way to remove the zombifies_into field didn't work. This was brought to light in #62008 where it turned out that copy_from and zombifies_into have a deep romance that cannot be broken by conventional means. Using delete will simply be ignored, while supposedly (I did not test that myself, however, that is what I was told is the case) setting zombifies_into to mon_null does stop the zombification while not removing the warning icon on a corpse.

Steps to reproduce

1. Find a small dog like a beagle, a chihuahua or a dachshund
2. Murder
3. Notice the revival warning icon
4. Check the code and notice that the zombifies_into should be properly removed
5. Cry

Expected behavior

delete should not randomly lose its expected functionality on just one random field. I'd hazard a guess it doing just that isn't expected considering #61668 was approved and merged.

Screenshots

A beautiful corpse of a dachshund with a revival warning icon despite the code implying the monster shouldn't zombify.

Versions and configuration

• OS: Windows
  • OS Version: 10.0.19043.2130 (21H1)
• Game Version: aa2a276 [64-bit]
• Graphics Version: Tiles
• Game Language: English [en]
• Mods loaded: [
  Dark Days Ahead [dda],
  Disable NPC Needs [no_npc_food],
  No Fungal Growth [no_fungal_growth],
  Bionic Professions [package_bionic_professions],
  Tamable Wildlife [Tamable_Wildlife]
  ]

Additional context

Didn't test it but I think it'd be worthwhile to take a look at what happens whether a monster using copy_from from some other monster that zombifies has a zombifies_into defined but aimed at a different zombie. Which zombie will it revive as?

[terryjacob200]

Tested in windows-tiles-sounds-x64-2022-10-30-0948 with base DDA only. Beagle Chihuahua Dachshund all revived. Puppies of all did not revive. Is that enough or should I try "delete" on other creatures?

[Karol1223]

Puppies of all did not revive.

Puppies should be unaffected since they use copy_from the labrador puppy which in itself doesn't revive, so them not reviving is expected but honestly thank god that at least that works how its expected to work.

[NetSysFire]

delete does not work, but why does explicitely overwriting zombifies_into to mon_null not work either?

Edit: apparently I am dumb but there is still a tileset issue which displays the reviving corpse warning.

[irwiss]

"zombify_into": "" should remove the revival marker