Magento 2.4.7 useless in mobiles, tablets and touchscreens wider than 768px

[cptX]

Preconditions and environment

• Magento version 2.4.7-p3
• Luma Theme

Steps to reproduce

Use the browser developer tools to get into mobile view with touch capability and select a screen width of 769px.
This makes Luma get into desktop theme which doesn't keep menus open for selecting submenus and also in product list the "Add to cart" buttons are not visible, so it's impossible to add products in cart!!

Expected result

The mobile theme should be kept for all touchscreen devices (if touch can be detected) or for screen width greater than 768px.

Actual result

Now in Luma theme, the theme changes to desktop even from a width of 769px, which makes it useless in mobiles in horizontal orientation and for tablets. This is major issue!!!
I don't know when this broke, I don't remember seeing this issue before.
I also don't know which file defines the breakpoint at which width the theme should be transformed to desktop. If you know please tell because this is major and I need to solve this asap!

Additional information

No response

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @cptX. Thank you for your report.
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[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
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[cptX]

@magento give me 2.4-develop instance

[engcom-Bravo]

Hi @cptX,

Thanks for your reporting and collaboration.

We have verified the issue in Latest 2.4-develop magento instance and the issue is reproducible.Kindly refer the screenshots.

The "Add to cart" buttons are not visible, so it's impossible to add products in cart.

Hence Confirming the issue.

Thanks.