"Last Contribution of a Contact" Condition not working properly

Overview

Last Contribution of a Contact condition is never (or always - dependig on operator) valid.

Reproduce

1. CiviCRM Drupal Sandbox
2. Create new CiviRule:
   • trigger: contribution is added
   • condition: last contribution of a contact
     • operator: last contribution is n days ago
     • compare value: 2
3. Select random contact (Individual)
4. Delete all contribution of selected contact (to not interfere with testing)
5. Record a new contribution for that contact with Date Received 2 days ago
6. Check CiviRule --> not triggered

There are several ways to reproduce the bug:

• set operator: contribution is more than n days ago --> trigger always fires
• set operator: contribution is less than n days ago --> trigger never fires

Comments

On update rule screen number of days is missing from condition description. I believe the values set for the days aren't retrieved.