Ruined portals can very rarely generate without any obsidian or chests

The Bug:

Ruined portals can very rarely generate without any obsidian or chests.

Here is an example:

Seed: 1264760945
Coordinates: /execute in minecraft:overworld run tp @s 44.84 67.00 642.20 -42.15 18.60

Steps to Reproduce:

1. Generate a world with the seed provided above and teleport to the given coordinates.
2. Look closely at the ruined portal.
3. Take note as to whether or not ruined portals can very rarely generate without any obsidian or chests.

Observed Behavior:

Ruined portals can very rarely generate without any obsidian or chests.

Expected Behavior:

Ruined portals would not be able to generate without any obsidian or chests.