[Order Creation] Wrong totals with multiple tax-inclusive products

[staskus]

Describe the bug

Related PRs: #11012
Discussion: p1721317864232889-slack-C6H8C3G23
Related CUW: peaMlT-ec-p2#comment-1834
Android issue: woocommerce/woocommerce-android#12138

When I add two tax-inclusive products (Yes, I will enter prices inclusive of tax), the order total sums up to a slightly wrong value. This only happens on iOS/Android and doesn’t happen on Web Checkout or WP Admin

To Reproduce
Steps to reproduce the behavior:

1. Enable Settings -> Tax -> Yes, I will enter prices inclusive of tax setting
2. Open Woo app
3. Orders -> Add New (+)
4. Select the same product twice
5. Notice it sums up to a slightly wrong value. e.g. two $16 products sum up to $32.01

Screenshots

Expected behavior
A clear and concise description of what you expected to happen.

Isolating the problem (mark completed items with an [x]):

• I have deactivated other plugins and confirmed this bug occurs when only WooCommerce plugin is active.
• This bug happens with a default WordPress theme active, or Storefront.
• I can reproduce this bug consistently using the steps above.

Mobile Environment
Please include:

• Device:
• iOS version:
• WooCommerce iOS version:

WordPress Environment

``` Copy and paste the system status report from **WooCommerce > System Status** in WordPress admin. ```

[dangermattic]

Thanks for reporting! 👍

[Ecarrion]

@toupper this and woocommerce/woocommerce-android#12138 seems important, would you agree to set it to on the Next queue?

[toupper]

@Ecarrion thanks for pinging me here! As we talked about yesterday, there's no strict separation of tasks depending on tabs, so this one, whose project we didn't work on, doesn't have to be in Eagle Backlog.