Description of problem:
I was very surprised too see this downgrade message today.
**Silverblue wants to downgrade(!) my Firefox for multiple versions.**

I can only assume this is an error.

Version-Release number of selected component (if applicable):
see above

How reproducible:
Don't know.

Steps to Reproduce:
Run rpm-ostree status -v on Silverblue.

Actual results:
```shell
$ rpm-ostree status -v   
State: idle
AutomaticUpdates: stage; rpm-ostreed-automatic.timer: last run 21min ago
Deployments:
  ostree://fedora:fedora/33/x86_64/silverblue
                   Version: 33.20210328.0 (2021-03-28T00:47:34Z)
                BaseCommit: 3d0853ae8e01ac1a168abc4f101e875e2dbee4ebe22a8f18ce2d507cb5e08903
                            ├─ repo-0 (2020-10-19T23:27:19Z)
                            ├─ repo-1 (2021-03-28T00:15:42Z)
                            └─ repo-2 (2021-03-28T00:20:26Z)
                    Commit: ecf1ebc390a2b450eb5e99408f5a3b7bebcdf6163fcd3c554d4c6b5ca10d1d50
                            ├─ fedora (2020-10-19T23:27:19Z)
                            ├─ rpmfusion-free (2020-10-16T17:39:10Z)
                            ├─ fedora-cisco-openh264 (2020-08-25T19:10:34Z)
                            ├─ updates (2021-03-27T00:57:25Z)
                            ├─ rpmfusion-free-updates (2021-03-25T08:58:17Z)
                            └─ updates-archive (2021-03-28T02:21:35Z)
                    Staged: yes
                 StateRoot: fedora
              GPGSignature: 1 signature
                            Signature made So 28 Mär 2021 01:47:39 CET using RSA key ID 49FD77499570FF31
                            Good signature from "Fedora <fedora-33-primary>"
                  Upgraded: cups 1:2.3.3op2-1.fc33 -> 1:2.3.3op2-3.fc33
                            cups-client 1:2.3.3op2-1.fc33 -> 1:2.3.3op2-3.fc33
                            cups-filesystem 1:2.3.3op2-1.fc33 -> 1:2.3.3op2-3.fc33
                            cups-ipptool 1:2.3.3op2-1.fc33 -> 1:2.3.3op2-3.fc33
                            cups-libs 1:2.3.3op2-1.fc33 -> 1:2.3.3op2-3.fc33
                            dbus-broker 27-2.fc33 -> 28-3.fc33
                            gdk-pixbuf2 2.42.2-2.fc33 -> 2.42.4-1.fc33
                            gdk-pixbuf2-modules 2.42.2-2.fc33 -> 2.42.4-1.fc33
                            gjs 1.66.2-3.fc33 -> 1.66.2-4.fc33
                            gnome-desktop3 3.38.4-1.fc33 -> 3.38.5-1.fc33
                            mesa-dri-drivers 20.3.4-2.fc33 -> 20.3.5-1.fc33
                            mesa-filesystem 20.3.4-2.fc33 -> 20.3.5-1.fc33
                            mesa-libEGL 20.3.4-2.fc33 -> 20.3.5-1.fc33
                            mesa-libGL 20.3.4-2.fc33 -> 20.3.5-1.fc33
                            mesa-libgbm 20.3.4-2.fc33 -> 20.3.5-1.fc33
                            mesa-libglapi 20.3.4-2.fc33 -> 20.3.5-1.fc33
                            mesa-libxatracker 20.3.4-2.fc33 -> 20.3.5-1.fc33
                            mesa-vulkan-drivers 20.3.4-2.fc33 -> 20.3.5-1.fc33
                            mozjs78 78.8.0-2.fc33 -> 78.9.0-1.fc33
                            nss-softokn-freebl 3.62.0-1.fc33 -> 3.63.0-1.fc33
                            pipewire 0.3.24-1.fc33 -> 0.3.24-4.fc33
                            pipewire-gstreamer 0.3.24-1.fc33 -> 0.3.24-4.fc33
                            pipewire-libs 0.3.24-1.fc33 -> 0.3.24-4.fc33
                            qt 1:4.8.7-57.fc33 -> 1:4.8.7-60.fc33
                            qt-common 1:4.8.7-57.fc33 -> 1:4.8.7-60.fc33
                            qt-x11 1:4.8.7-57.fc33 -> 1:4.8.7-60.fc33
                Downgraded: firefox 87.0-2.fc33 -> 81.0.1-1.fc33
                            nss 3.62.0-1.fc33 -> 3.57.0-1.fc33
                            nss-softokn 3.62.0-1.fc33 -> 3.57.0-1.fc33
                            nss-sysinit 3.62.0-1.fc33 -> 3.57.0-1.fc33
                            nss-util 3.62.0-1.fc33 -> 3.57.0-1.fc33
       RemovedBasePackages: pulseaudio-module-bluetooth 14.0-2.fc33
           LayeredPackages: ***
             LocalPackages: rpmfusion-free-release-33-1.noarch

● ostree://fedora:fedora/33/x86_64/silverblue
                   Version: 33.20210327.0 (2021-03-27T00:45:34Z)
                BaseCommit: b6234daf046fcc44cdfa1b49a40ea0a538e1970905256e60477c03eb6b6b11c2
                            ├─ repo-0 (2020-10-19T23:27:19Z)
                            ├─ repo-1 (2021-03-27T00:16:53Z)
                            └─ repo-2 (2021-03-27T00:24:33Z)
                    Commit: 845fcc51d6367138360a696ed5c59148404e354ca63f1ecb9e781814f5a25a69
                            ├─ fedora (2020-10-19T23:27:19Z)
                            ├─ rpmfusion-free (2020-10-16T17:39:10Z)
                            ├─ fedora-cisco-openh264 (2020-08-25T19:10:34Z)
                            ├─ updates (2021-03-27T00:57:25Z)
                            ├─ rpmfusion-free-updates (2021-03-25T08:58:17Z)
                            └─ updates-archive (2021-03-27T02:41:56Z)
                 StateRoot: fedora
              GPGSignature: 1 signature
                            Signature made Sa 27 Mär 2021 01:45:43 CET using RSA key ID 49FD77499570FF31
                            Good signature from "Fedora <fedora-33-primary>"
       RemovedBasePackages: pulseaudio-module-bluetooth 14.0-2.fc33
           LayeredPackages: ***
             LocalPackages: rpmfusion-free-release-33-1.noarch

  ostree://fedora:fedora/33/x86_64/silverblue
                   Version: 33.20210326.0 (2021-03-26T00:52:21Z)
                BaseCommit: da512b217d2b1dac0dfd23ba8e433b7f00fce3ab2d5e65f3dac68ab646e22bcc
                            ├─ repo-0 (2020-10-19T23:27:19Z)
                            ├─ repo-1 (2021-03-26T00:16:18Z)
                            └─ repo-2 (2021-03-26T00:20:59Z)
                    Commit: 1dcdb3639c6c5e4b039091a5ef5e658d8d5a00752e9900521df5135d5e2b4101
                            ├─ fedora (2020-10-19T23:27:19Z)
                            ├─ rpmfusion-free (2020-10-16T17:39:10Z)
                            ├─ fedora-cisco-openh264 (2020-08-25T19:10:34Z)
                            ├─ updates (2021-03-26T01:00:44Z)
                            ├─ rpmfusion-free-updates (2021-03-25T08:58:17Z)
                            └─ updates-archive (2021-03-26T19:07:20Z)
                 StateRoot: fedora
              GPGSignature: 1 signature
                            Signature made Fr 26 Mär 2021 01:52:29 CET using RSA key ID 49FD77499570FF31
                            Good signature from "Fedora <fedora-33-primary>"
       RemovedBasePackages: pulseaudio-module-bluetooth 14.0-2.fc33
           LayeredPackages: ***
             LocalPackages: rpmfusion-free-release-33-1.noarch

```

Notice the line:
>firefox 87.0-2.fc33 -> 81.0.1-1.fc33

Expected results:
An upgrade? Or no upgrade at all?

Additional info:
I looked at 
https://bodhi.fedoraproject.org/updates/?packages=firefox

and
https://koji.fedoraproject.org/koji/packageinfo?packageID=37

and could not see the outdated build here, so what is wrong?

Also reported in the forum: https://discussion.fedoraproject.org/t/silverblue-wants-to-downgrade-firefox-87-to-v81-with-silverblue-v33-20210328-0/28410?u=rugk