Why does apt list show arm64 packages on my amd64 machine?

I would like to get an explanation as to why apt list command shows two arm64 packages on my amd64 machine/system - Linux Mint 22 (Ubuntu Noble based). And once explained, let's discuss if I can do something about it. *** Please note, that I remove the following message, along with possibly other unimportant strings from the below listings for shortness. > WARNING: apt does not have a stable CLI interface. Use with caution in scripts. *** Running these commands as a user or root, or changing the way I specify grep filter, does not have any effect on the result, which is always the same = two arm64 Sublime packages show up on my amd64 machine. Before I start, let me mention the manual pages first: 1) GNU grep ; 2) POSIX grep .

# apt list | grep -v 'amd64\|all\|i386'  # I ran this as root

sublime-merge/apt/stable 2102 arm64
sublime-text/apt/stable 4189 arm64

$ apt list | grep 'arm64$'  # I ran this as an ordinary user

sublime-merge/apt/stable 2102 arm64
sublime-text/apt/stable 4189 arm64

Now, let's get some basic info about these packages:

$ apt list sublime-text sublime-merge

sublime-merge/wilma,apt/stable 2102 amd64
sublime-merge/apt/stable 2102 arm64
sublime-text/apt/stable,now 4189 amd64 [installed]
sublime-text/apt/stable 4189 arm64

^^ Why the heck are those two arm64 architecture packages showing up? It's been a long time since I have edited most of my /etc/apt/sources.list.d/*.{list,sources} to explicitly contain the architecture, and I thought it would enforce it, no?

$ apt-cache policy sublime-text sublime-merge

sublime-text:
  Installed: 4189
  Candidate: 4189
  Version table:
 *** 4189 500
        500 https://download.sublimetext.com  apt/stable/ Packages
        100 /var/lib/dpkg/status
     4186 500
        500 https://download.sublimetext.com  apt/stable/ Packages
     4180 500
        500 http://packages.linuxmint.com  wilma/import amd64 Packages
        500 https://download.sublimetext.com  apt/stable/ Packages
...

sublime-merge:
  Installed: (none)
  Candidate: 2102
  Version table:
     2102 500
        500 http://packages.linuxmint.com  wilma/import amd64 Packages
        500 https://download.sublimetext.com  apt/stable/ Packages
     2096 500
        500 https://download.sublimetext.com  apt/stable/ Packages
     2091 500
        500 https://download.sublimetext.com  apt/stable/ Packages
...

I have explicitly set, where applicable, the amd64 architecture like so:

deb [arch=amd64 ...

and the sublime-text sources list file is not an exception from this rule of mine:

$ cat /etc/apt/sources.list.d/sublime-text.list

deb [arch=amd64 signed-by=/usr/share/keyrings/sublimehq-archive.gpg] https://download.sublimetext.com/  apt/stable/

So, now I am not sure what this arch=amd64 clause in there is actually doing, if not preventing loading/downloading only this particular architecture from such repository? Would anyone care to clarify, please? And if you know how to prevent this from happening, I would appreciate it. Thank you. *** For completness, let me specify my primary and other architectures I have added to my OS:

$ dpkg --print-architecture
amd64

$ dpkg --print-foreign-architectures
i386

Cheers. *** This will be a comments section: - 1st request came from Stephen Kitt , thank you.

$ apt policy sublime-{text,merge}:arm64

sublime-text:arm64:
  Installed: (none)
  Candidate: 4189
  Version table:
     4189 500
        500 https://download.sublimetext.com  apt/stable/ Packages
     4186 500
        500 https://download.sublimetext.com  apt/stable/ Packages
     4180 500
        500 https://download.sublimetext.com  apt/stable/ Packages
...

sublime-merge:arm64:
  Installed: (none)
  Candidate: 2102
  Version table:
     2102 500
        500 https://download.sublimetext.com  apt/stable/ Packages
     2096 500
        500 https://download.sublimetext.com  apt/stable/ Packages
     2091 500
        500 https://download.sublimetext.com  apt/stable/ Packages
...