QB Issue Resolution:

Why not use different Templates, then? Only select the Discount template when there is a Discount to show them.

Resolution for Issue 'How do I show the pricing rule discount on a customer invoice?' available: Yes (Solved).
Source: Intuit Community forum.

How do I show the pricing rule discount on a customer invoice?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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