Missing Custom Ambience when Origin Realms updated to 1.20.1

When the server updated to 1.20.1, some of the custom ambience in the server just stopped playing. Here are some of the ambient tracks that aren't playing in these areas:
1. Custom Ambient Track in Origin Isles
2. Custom Ambient Track in Blighted Badlands / Marauder Arena (Note: This is the custom ambience that OR added in 1.7, not the additional nether ambience that is playing in the game at that time and this moment.)

This seems to happen when I use no mods so it seems to be an issue with OR's resource pack.