Villages houses or structures can generate with parts of the terrain (blocks or plants) inside them.
How to reproduce
Last checked in 20w10a
Even if these seeds and coordinates do not show this problem anymore, it might not be fixed, instead maybe the world generation just changed.
Leaves blocking house entrance
/execute in minecraft:overworld run tp @s -4575.59 73.68 997751.43 547.35 59.55
Stone inside savanna house
/execute in minecraft:overworld run tp @p 51217 71 75918 -127.5 -37.5