Issue: 

We use extension version 2.2.3 on M2.4.1 and find that your extension has a problem calculating the taxes 

When we change provinces it doesn't even recalculate the taxes


Solution:


The root of the issue is that the tax is not updated on the site when the region_id changes but not trigger ajax call.

We have fixed this issue and modified this file 

app/code/Bss/OneStepCheckout/view/frontend/web/js/model/shipping-rates-validation-rules-mixin.js

Please apply the attachment and flush the cache on site.


If you need any further support, please feel free to contact us.

We'd like to help.