Filter "working_dir: /" didn't properly filter

[jkppr]

Describe the bug
When using the filter icons in the UI to filter some special character values, the filtering does not work properly.

To Reproduce
Steps to reproduce the behavior:

1. Create a sketch with a timeline that has a field with the value = / or -.
2. Click on the filter icon next to the field name.
3. The filterchip will be added but it does not filter the value from the results.

Expected behavior
The filterchip should filter those values as well.

Screenshots