Selector wildcard doesn't work in scoreboard operations

The bug

When using a selector wildcard (*) in scoreboard players operation doesn't work

How to reproduce

1. Create an objective:

   /scoreboard objectives add test dummy

2. Set some 'random' scores on the objective:

   /execute as @e run scoreboard players add @e[sort=random,limit=5] test 10

3. The following won't work:

   /scoreboard players operation @s test > * test