0011708: Bugged grass is trampled immediately and grazers can't eat it

Notes
(0040946) peanutsnraisins (reporter) 2021-03-02 10:32	Additional testing has shown that this only occurs in forts in the temperate conifer forest biome. Temperate savanna and temperate shrubland have the usual varied grasses (the world has limited biomes so I couldn't test them all). Here's a save in the same world: https://dffd.bay12games.com/file.php?id=15450 [^] There are two pastures near the wagon. The one on the left with a water buffalo has only "grass" and is placed in a temperate conifer forest. The one of the right with a yak is placed in a temperate shrubland and has varied grasses (knotgrass, hair grass, etc). So far I can't duplicate this bug in any newly-created world.

(0040947) PatrikLundell (reporter) 2021-03-02 23:49	The reason is that the biome doesn't have any normal grass associated to it. It does have wormy tendrils and eyeballs, but as this area isn't evil those don't apply. I would guess that the RNG happened to not select any of the available kinds of grass for this biome, something that's probably very uncommon. Either DF accepts very rare freak cases like this or it includes a check to ensure at least one kind of grass is available in every biome. It could be that there is such a check, but that it's broken by the introduction of spreading evil, as evil used to be tied to regions, so a region was all evil or all non evil (or all good), so eyeballs alone would be sufficient to satisfy an "any grass?" check. If so, the logic would have to be extended to check that there's any neutral grass available in regions that are neutral natively.

Issue History
Date Modified	Username	Field	Change
2021-03-02 09:27	peanutsnraisins	New Issue
2021-03-02 10:32	peanutsnraisins	Note Added: 0040946
2021-03-02 23:49	PatrikLundell	Note Added: 0040947

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