commands in scheduled functions that take longer than 1 tick are interrupted

Trying to spawn loot in a function that takes a bit to spawn (exploration maps).

When running the function directly, I get the specified loot (rather quickly, probably within a few ticks).

When scheduling the function, I instead sometimes get a weird map that can spawn more maps when right clicked. I believe this is because the map was not generated within 1 tick.

Easiest way to reproduce is with endcity maps in the end with the following function:

loot give @s loot halemaster:explore/map_endcity

And loot table:

{
    "type": "minecraft:generic",
    "pools": [
      {
        "rolls": 1,
        "entries": [
          {
            "type": "minecraft:item",
            "name": "minecraft:map",
            "weight": 5,
            "functions": [
                {
                    "function": "minecraft:exploration_map",
                    "destination": "EndCity",
                    "decoration": "target_x",
                    "zoom": 1,
                    "skip_existing_chunks": false
                },
                {
                    "function": "minecraft:set_nbt",
                    "tag": "{\"display\": {\"MapColor\": 16711935},\"to_explore_map\": map_endcity}"
                },
                {
                    "function": "minecraft:set_name",
                    "name": "End City Explorer Map"
                }
            ]
          }
        ]
      }
    ]
}

And then you can do the following:

/function <funcName>

and

/schedule function <funcName> 1s