The radius selector generates a major bug with new function system difficult to describe. The selection is not respected and even when we put a much larger ray, it's able to detect but not always.
Watch the video to understand.

Details:
This function will be executed with /gamerule gameLoopFunction function
The first video uses the command:

• /execute @a [score_spell_min = 1] ~ ~ ~ say @e [type = Snowball,r = 3, c = 1] // radius of 3, sufficient before this pre release

with the following command:

• /scoreboard players set @a [score_spell_min = 1] spell 0

The second video uses the same command with a different radius:

• /execute @a [score_spell_min = 1] ~ ~ ~ say @e [type = Snowball, r = 50, c = 1] // Here 50, more than enough if there is no bug

Video 1: https://youtu.be/y1PMA1vPOEM
Video 2: https://youtu.be/u6dOItnp_4s