AR: Invoices generated using copy functionality are calculating Tax

Hello Support,
AR transactions are calculating TAX when using the COPY TO functionality even though the Tax classification is selected as EXEMPT.
Normally the transactions were not intended to calculated Tax when it is EXEMPT.
In the current period, it is correct as the Tax is not getting calculated when selecting EXEMPT.

We have recently implemented the GAPLESS DOCUMENT SEQUENTIAL NUMBERING for Account Receivable on the company which is having this problem and we suspect that the setup can be the cause of this problem.

Therefore we tested same in another company where we did not implement the Gapless document sequential numbering and noticed that the Invoices generated using the COPY TO functionality were not calculating the tax when EXEMPT is selected in the Tax classification.