Steps to Reproduce:

1. Create a custom field and add it into an agile ticket (e.g.: Single line text: Text field = lol)
2. Create an agile board (no matter which one)
3. Go to: Board > Configure > Card Color
4. Select option Query > Select a color and type:
   "Text field" = lol
   P.s.: You can also try "Text field" = "lol"

Expected Results:
On the board, the cards that have this custom field would be with the color that you have previously chosen.

Actual Results:
Nothing happens with the card. No colors changed.

Workaround:
—

Notes:
This does not happen if you choose any JIRA default field, like: assignee, issue type, component, etc. This seems to be only happening to custom fields.