Package bcmwl-kernel-source version 6.30.223.271+bdcom-0ubuntu7~20.04.3 is not installed because apt thinks it’s a downgrade

1) Ubuntu release: 20.04
2) Installed package version: 6.30.223.271+bdcom-0ubuntu7
3) Expectation: bcmwl-kernel-source version 6.30.223.271+bdcom-0ubuntu7~20.04.3 was released to focal-updates to fix LP: #1932159 (building the kernel module with HWE kernel 5.11 on Ubuntu 20.04). The bcmwl-kernel-source package should be updated to the version in focal-updates.
4) Actual result: apt considers the package from focal-updates a downgrade, leaving the system with broken WiFi after updating to the HWE kernel.

$ apt-cache policy bcmwl-kernel-source
bcmwl-kernel-source:
  Installed: 6.30.223.271+bdcom-0ubuntu7
  Candidate: 6.30.223.271+bdcom-0ubuntu7
  Version table:
 *** 6.30.223.271+bdcom-0ubuntu7 100
        100 /var/lib/dpkg/status
     6.30.223.271+bdcom-0ubuntu7~20.04.3 500
        500 http://de.archive.ubuntu.com/ubuntu focal-updates/restricted amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/restricted amd64 Packages
     6.30.223.271+bdcom-0ubuntu5 500
        500 http://de.archive.ubuntu.com/ubuntu focal/restricted amd64 Packages
$ sudo apt install bcmwl-kernel-source=6.30.223.271+bdcom-0ubuntu7~20.04.3
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libllvm11 libllvm11:i386 shim
Use 'sudo apt autoremove' to remove them.
The following packages will be DOWNGRADED:
  bcmwl-kernel-source
0 upgraded, 0 newly installed, 1 downgraded, 0 to remove and 0 not upgraded.
Need to get 1,546 kB of archives.
After this operation, 8,192 B of additional disk space will be used.
Do you want to continue? [Y/n]