Entity Localization Bug: Symbol. Citation reference misdetected as symbols in arXiv paper 1811.12889

**Name this issue**

Give this issue a name:

```
Entity Localization Bug: Symbol. Citation reference misdetected as symbols in arXiv paper 1811.12889
```

*Example*: For example, if the pipeline fails to detect a citation "(Weld et al. 2010)" in arXiv paper "1811.12889", the name of this issue should be:

```
Entity Localization Bug: Citation. (Weld et al. 2010) not detected in arXiv paper 1811.12889
```

**Assign labels**

Assign this issue two labels, one for each of:
1. The entity type (`citation` or `symbols`)
2. The localization issue type (`missing-entity-detection` or `bad-entity-detection`)

**Describe the bug**

The body of this bug report must include:

_Description_: the `3.2` in "section 3.2" should be a citation location reference, but it is being separately detected as mathematical symbols `3` and `2`.

_Screenshot_:

_URL (optional)_: A URL to a live version of the Scholar Reader (i.e. an `https://s2-reader.apps.allenai.org` address) where the bug can be seen.

_How to fix (optional)_: If you know how the pipeline or UI can be modified to fix this issue, provide a 1-2 sentence description here.