burning zombies under the bed!

I play minecraft version 1.15.2 and decided to go to the village and posobirat beds, I put them together, and I suddenly heard how I was beaten from the back, turn around, and there is a zombie resident, since that village was abandoned, I decided to save this zombie, and decided to dig a hole under the beds, and hide the zombies there(at this time it was raining and it was day), I pushed the zombie there and it caught fire although at this moment there was a yeast.