syntax grammar problem: fallback choices break formatting for the next line

Using a (slightly modified, but not in anything that should affect this) syntax grammar that's included in this repo in Atom:
```
* choice group A[]
this is choice group A!
* * choice 1[] choice outcome
* * choice 2[] choice outcome
* * -> another_stitch
* choice group B[] <-- the formatting here breaks, choice bullets do not get parsed
// etc.
```

am i going crazy? formatting the fallback choice like this fixes the issue:

```
* * []
-> another_stitch
```

Including a blank line after the fallback choice fixes the issue also.