Double scores defintition in selectors crashes minecraft. when using functions

Partner Rank

4

Partner Team Reporting

Blockception

Verification builds

Windows 1.14.1

Summary

Double score definitions in selectors cause Minecraft to crash. but only if they are inside mcfunctions.

Impact

It made debugging harder as I had no idea what caused Minecraft to cause. normally an error during parsing is given with such mistakes. Or malfunction simply malfunctions but never crashes.

Repro Steps

Step 1: Create a mcfunction that is executable from inside the world.
Step 2: Give it a command to run that uses a selector as a way of targeting
Step 3: Define a scoreboard value twice like such:

```
testfor @e[scores=

{A=0}

,scores=

{B=1..}

]
```

Step 4: execute mcfunction.

Repro Rate

100% on my end.

Observed Results

Minecraft freezes and then simply quits.

Expected Results

Either report the error back to the user during parsing or executions of the function. but not a hard crash

Regression Builds

No idea

Notes

I added a test world with a function called mistake that causes my Minecraft to crash.
and a function called proper that works as intended