autopkgtest i386 - problem with installation artifacts

Hi, yesterday a new autopkgtest for the i386 architecture was added, this commit: 79468b1b

And the autopkg test for NGINX, which I'm currently working on, started failing. Here: https://salsa.debian.org/nginx-team/nginx/-/jobs/8148094

It looks like the new autopkgtest for the i386 doesn't install artifacts (packages built in the pipeline), but only package from unstable apt source.

Here is another example (bearssl - test branch): https://salsa.debian.org/debian/bearssl/-/pipelines/923886

bearssl build i386 https://salsa.debian.org/debian/bearssl/-/jobs/8148215#L1223

dpkg-deb: building package 'libbearssl0' in '../libbearssl0_0.6+dfsg.1-5+salsaci+20250830+66_i386.deb'.

bearssl autopkgtest i386 https://salsa.debian.org/debian/bearssl/-/jobs/8148222

Preparing to unpack .../31-libbearssl0_0.6+dfsg.1-5_i386.deb ...
Unpacking libbearssl0:i386 (0.6+dfsg.1-5) ...

... and for comaparsion OK bearssl autopkgtest amd64 https://salsa.debian.org/debian/bearssl/-/jobs/8148221

Preparing to unpack .../34-libbearssl0.deb ...
Unpacking libbearssl0:amd64 (0.6+dfsg.1-5+salsaci+20250830+66) ...

/cc @otto