I have installed the extension v1.2.1 on M2.4.2.
If the extension is activated it prevents me from updating the decimal amounts from the cart summary
If I deactivate it, I can update the quantities from the cart summary without problem
The issue happens due to the extension bug on Magento 2.3.4 and above.
To solve this issue, we have edited this file Bss/HidePrice/view/frontend/templates/cart/item/default.phtml
(add attribute step="any" to line 121)
Please check and apply the fixed attachment to the site.
If you need any further assistance, please feel free to contact us.
We're more than happy to support you.