A state does not only pay attention to actual injuries.

What comes in addition?

The idea of a danger. Another state could become a threat. You estimate how likely this is. You suspect intentions. This too can become a reason for a dispute.

An image:

If the neighbor builds up his army, you ask yourself: against whom? This question alone can start a dispute.

Summary: Not only actual injuries lead to disputes. Suspected dangers and intentions can also be reasons for conflicts.