Tags prefixing a gather line don't appear

I'm encountering an issue where most of my tags don't appear to be showing up in the line immediately following a gather.

```
=== choice_test ===
- Line 0
* [Choice 1]
- - Choice 1 line 1
* [ Choice 2]
- - Choice 2 line 1
# before tag
- Line 2 # after tag
-> END
```

If I pick choice 1, then check `_inkStory.currentTags` when I reach line 2, it only returns "after tag". This behaviour doesn't seem to occur in the final choice in a set: if I pick choice 2, then it performs the expected behaviour of returning both "before tag" and "after tag".

I'm using version 0.8.1.