Message "Shipment cannot be released: Order is not fully paid" displays if return order has promotion higher priority than item promotion

Description

Steps to reproduce:

Precondition
4 promotions are set up.

1. $50 off order over $500 (order discount)
2. Spend at least $50 get discount $5 (order discount)
3. Buy women tee get $1
4. 20 % off mens shoes

1. Check out then complete order with 2 items of SKU-42313030 (edit price = 11$) and 1 item of SKU-44477844.
2. Create a return for 1 item of SKU-42313030.
3. Complete the return.

Expected:
After return, you do not see the message "Shipment cannot be released: Order is not fully paid."

Actual:
After completing return, open the Details tab again. You see the message "Shipment cannot be released: Order is not fully paid." in Shipment status.

Note: This issue does not happen when item promotions have a higher priority than the order promotion.