Candles and lanterns can generate in the air in Ancient City due to missing blocks

Summary:
Candles and lanterns can generate in air in Ancient City due to missing blocks.

Seed: 65793301529134716
Coords: 1323 -40 -698
Coords: 1312 -38 -658

Steps to reproduce:

1. Create a world with the specified seed.
2. Visit the specified coordinates.

Observed results:
Candles and lanterns are in the air without any support.

Expected results:
Candles and lanterns will not be generated in the air.

Image: