The bug

Similar to entity_scores in MC-183917, the time_check predicate condition requires either a specific value or a min and max value range. If either min or max were missing when checking for a value range, the predicate would fail to load:

{
  "condition": "minecraft:time_check",
  "value": {
    "min": 1000
  }
}

How to reproduce

1. Install the data pack below in a world for easier reproduction
2. Type the following command in chat:

   /execute if predicate 
   

   → The time_check:1000_time predicate does not load