Some commands in functions cause a NullPointerException

The bug

Previously it was possible to use the seed command in data pack functions. Now it makes the function invalid and shows a NullPointerException when loading.

execute store result score #seed temp run seed

How to reproduce

1. Download the attached data pack mc-186101.zip and place it in the world folder
2. /reload
   The function mc-186101:seed isn't loaded and an error is shown in the output log

   Failed to load function mc-186101:seed
   java.util.concurrent.CompletionException: java.lang.NullPointerException