Save on compile set to always causes a crash on compile

If the user uses the save on compile feature and attempts to compile a blueprint, this will cause the editor to crash

1. Open the editor
2. go to the editor preferences and set save on compile to always
   Editor preferences > Blueprint Editor > Save on Compile > Always
3. Create a new blueprint
4. Add a variable
5. Compile
6. Notice the editor crashes

Enum as macro input without default value

4.11 preview 7 crashes after saving on successful compiling

[4.11 p6] crash when compiling