Getting packages from debian backports not working as documented

Before dear community marks this question as duplicate please known that I've done site search and figured out there is no equivalent duplicate, for instance this [link](https://unix.stackexchange.com/questions/516664/debian-stretch-not-getting-package-from-stretch-backports) is not duplicate I have followed the following instructions: - https://wiki.debian.org/Backports - https://backports.debian.org/Instructions According to these instructions step No.1 is to update /etc/apt/sources.list by adding the following line: - deb http://deb.debian.org/debian bookworm-backports main contrib non-free When this step is done we need up update index by running sudo apt update From this point on we have two options: 1. Explicitly install a package from backports, for example - apt install -t bookworm-backports 2. Implicitly install a package from backports - apt install /bookworm-backports There is a significant difference between those 2 methods! The first method will install package from backports but will also pull in all it's dependencides also from backports including their dpenedencies and so on which results in "bloated" installation of a package. The second method is cleaner, better and recommended by debian because unlike first method it will reuse dependencies (from main, not from backports) and will pull in only the main package being installed that is from backports. In other words second method will reuse dependencies that are alaready insalled on system without downloading them. However under certain circumstances if that's not possible it will pull dependencies from backports (in rare scenarios though) The problem I'm having is that first method with -t options always works while the second method never works at all. I want to know why that is and how can I make the second method work? Here are two examples that are reproducible for you to test:

sudo apt install wine/bookworm-backports
sudo apt install passwordsafe/bookworm-backports

Here is the output from first example: > sudo apt install wine/bookworm-backports Reading package lists... Done Building dependency tree... Done Reading state information... Done Package wine is a virtual package provided by: wine 8.0~repack-4 You should explicitly select one to install. E: Release 'bookworm-backports' for 'wine' was not found As you can see bookworm-backports was not found! However if you run with -t option you can confirm this is false: sudo apt install wine -t bookworm-backports Which will work just fine and offer you to install the package. So the question is very simple, why doesn't second method (without the -t option) not work and what do I need to do to make it work, do I do something wrong? --- For additional information I'm using Debian 12 (bookworm) And my sources.list looks like this: deb https://deb.debian.org/debian/ bookworm main deb-src https://deb.debian.org/debian/ bookworm main deb http://security.debian.org/debian-security bookworm-security main deb-src http://security.debian.org/debian-security bookworm-security main deb https://deb.debian.org/debian/ bookworm-updates main deb-src https://deb.debian.org/debian/ bookworm-updates main deb https://deb.debian.org/debian/ bookworm-backports main deb-src https://deb.debian.org/debian/ bookworm-backports main