Bug in Purchase Invoice the Total field in Purchase Taxes and Charges

In the field total in purchase taxes and charges in purchase invoice the total amount change and it is not equal to the total amount of the item. I just want to confirm if this is a bug.

Frappe - Version 15.49.1
ERPNext - Version 15.45.4

Btw it is not a bug I tried to track the code and the calculation is total = net_total + tax_amount. But how to disable the rounding in the taxes total?