The source tarball contains a prebuilt binary wasm object. They are usually provided for the convenience of users. These files usually just take up space in the tarball and need to be rebuilt from source.
Check if upstream also provides source-only tarballs that you can use as the upstream distribution instead. If not, you may want to ask upstream to provide source-only tarballs.
The tag is present in Lintian version
That is the most recent version we know about.
We use semantic versions.
The patch number is a commit step indicator relative to the
release tag in our Git
You can find the detection logic for this version at commit ea05801. For merge requests, please use the latest version in the Lintian check files/source-missing.