Old price excluding TAX is incorrectly replaced by JavaScript

[VesnaS]

Preconditions

1. Tested on Magento versions 2.4-develop
2. PHP 7.2

Steps to reproduce

1. In Admin, set Stores -> Configuration -> SALES -> Tax -> Price Display Settings -> Display Product Prices In Catalog to "Including and Excluding Tax"
2. Configure tax class and set it for the product
3. Set special price for the product
4. In vendor/magento/module-catalog/view/base/templates/product/price/final_price.phtml, set "skip_adjustments" to FALSE for "old-price"

Expected result

1. On product detail view page in frontend, old price and new price are displayed with and without TAX

Actual result

1. New price and old price excluding TAX are the same. This happens because JavaScript in vendor/magento/module-catalog/view/base/web/js/price-box.js replaces prices incorrectly.

[magento-engcom-team]

@VesnaS, thank you for your report.
We've created internal ticket(s) MAGETWO-83250 to track progress on the issue.

[joachimVT]

I can confirm this having the same issue on version 2.2.2