The bug

Unlike other advancement and predicate conditions, the entity_scores predicate condition requires both a min and max value to be loaded properly.

This does not happen with other predicate conditions such as location_check which loads properly without having to specify both values:

{
    "condition": "location_check",
    "predicate": {
        "position": {
            "y": {
                "min": 256
            }
        }
    }
}

How to reproduce

1. Install the attached data pack in a Minecraft world.
2. Observe game:wrong_predicate:

   {
       "condition": "entity_scores",
       "entity": "this",
       "scores": {
           "objective": {
               "min": 1
           }
       }
   }
   

3. Observe game:correct_predicate:

   {
       "condition": "entity_scores",
       "entity": "this",
       "scores": {
           "objective": {
               "min": 1,
               "max": 2147483647
           }
       }
   }
   

4. Type the following command in chat but do not run it:

   /execute if predicate

   → You will notice that only game:correct_predicate shows up.