Packages are missing

[Splinx64]

Hi Sparky users,

I use the testing release of Sparky Linux 8.

Since last update some days ago I have the problem, that I can not install some programs, they I used before.
After the updating procedere they are not available in the database.

For instance, these are some of for me important programs:
GIMP
xsane
k3b

For examle, when I try to install GIMP, I get the following messages (translated):

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$ sudo apt install gimp
Package gimp is not available, but is supported by another package
referenced. This can mean that the package is missing, that it has been replaced
or is only available from another source.

Error: There is no installation candidate for package "gimp".
Some months ago I have had a similar problem. But, in this case the reason were not suitable sources - in my case for "unstable". At that time I could solve the problem by removing these sources.

But, now, I think, my sources are up to date. In last months my system works without any problems. Here are my current sources.

sources.list

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deb http://deb.debian.org/debian/ trixie main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian/ trixie main contrib non-free non-free-firmware
deb http://security.debian.org/debian-security/ trixie-security/updates main contrib non-free non-free-firmware
deb-src http://security.debian.org/debian-security/ trixie-security/updates main contrib non-free non-free-firmware
deb http://deb.debian.org/debian/ trixie-updates main contrib non-free non-free-firmware
deb-src http://deb.debian.org/debian/ trixie-updates main contrib non-free non-free-firmware
deb http://deb-multimedia.org/ trixie main non-free
sparky.list

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### sparky core repository is used by all sparky editions
deb [signed-by=/usr/share/keyrings/sparky.gpg.key] https://repo.sparkylinux.org/ core main
deb-src [signed-by=/usr/share/keyrings/sparky.gpg.key] https://repo.sparkylinux.org/ core main

### sparky sisters repository
deb [signed-by=/usr/share/keyrings/sparky.gpg.key] https://repo.sparkylinux.org/ sisters main
deb-src [signed-by=/usr/share/keyrings/sparky.gpg.key] https://repo.sparkylinux.org/ sisters main

Have you any idea to solve my problem?

Thank you in advance for your help.