This issue affects:

• Spigot 1.20.2 (tested on "This server is running CraftBukkit version 3898-Spigot-a0f3d48-ef7a474 (MC: 1.20.2) (Implementing API version 1.20.2-R0.1-SNAPSHOT)")
• CraftBukkit 1.20.2 (tested on "This server is running CraftBukkit version 3898-Bukkit-ef7a474 (MC: 1.20.2) (Implementing API version 1.20.2-R0.1-SNAPSHOT)")

This issue does not affect:

• Vanilla 1.20.2
• Vanilla 1.20.1
• Spigot 1.20.1 (tested on "This server is running CraftBukkit version 3871-Spigot-d2eba2c-3f9263b (MC: 1.20.1) (Implementing API version 1.20.1-R0.1-SNAPSHOT)")

The core of the issue is stated in the title. As of 1.20.2, if Spigot or CraftBukkit attempts to load a datapack containing multiple predicate .json files with the exact same contents, it will crash on startup with the attached error (latest.log). A minimal datapack for reproducing this issue has also been attached (predicate_bug.zip).

Exact steps for reproduction:

1. Create a new server running the latest version of Spigot 1.20.2.
2. Add the attached reproduction datapack (predicate_bug.zip) to the world/datapacks/ folder.
3. Attempt to start the server. An error will be given and the server will not start.

The thread linked in the report guidelines tells me to say how much time I spent getting the above information together, so uh, it was around a half hour, I think? I wasn't timing myself.