Grass blocks generated under ancient city center redstone room

We do not have enough information to reproduce this issue.

Please provide the following information about the world you are playing in as text. Attaching a screenshot showing them is not enough.

• World Type:

  • "Default" if you have not chosen one when creating the world

  • For "Superflat": Provide the generation preset

  • For "Amplified" or "Large Biomes": Specify if the world is Amplified or a Large Biome world type

  • For "Single Biome": Specify which biome was chosen

• Additional generation settings (in case you changed them): E.g. "Generate Structures", "Bonus Chest", ...

• Seed: Can be obtained by using the /seed command and clicking on the message in chat

• Coordinates: Can be copied to clipboard by pressing F3 + C

• Data Packs: If you use any world generation data packs, please attach or provide a download link to the used data pack(s)

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Relates to or duplicates MC-236613.

I can also confirm this behavior although, this ticket isn't related to MC-236613; allow me to elaborate.

The grass blocks generated within this redstone room appear in all 3 unique ancient city centers and are actually included within the structures themselves. They are not placed here because of the generation of overworld surface blocks. If you were to summon these structures (ancient city centers) through the use of structure blocks, you will notice that the grass blocks are still present (are included within the generation of the structure), therefore leading me to believe that this could be intentional.

You can execute the following commands and power the structure blocks in order to reproduce this issue.

/setblock ~ ~ ~ minecraft:structure_block{mode:"LOAD",name:"ancient_city/city_center/city_center_1"}

/setblock ~ ~ ~ minecraft:structure_block{mode:"LOAD",name:"ancient_city/city_center/city_center_2"}

/setblock ~ ~ ~ minecraft:structure_block{mode:"LOAD",name:"ancient_city/city_center/city_center_3"}