The bug

Desert villages generate cactus blocks as part of the decoration. However, the placement rules of cactus blocks are not considered:

• They are placed directly next to other blocks, which is normally not possible
• They are placed on blocks other than sand (e.g. sandstone)

How to reproduce

Last tested for 20w51a

2497334744588602023

/execute in minecraft:overworld run tp @s 90783.40 65.01 -878.80 527.85 30.30