I have a repository tagged with x/v1.0.0

Now when configuring semver-action like this:

  - name: Get Next Version
    id: semver
    uses: ietf-tools/semver-action@v1.5.1
    with:
      token: ${{ github.token }}
      branch: main
      noVersionBumpBehavior: current
      prefix: x/

I get this:

Run ietf-tools/semver-action@v1.5.1
with:
token: ***
branch: main
noVersionBumpBehavior: current
prefix: x/
minorList: feat, feature
patchList: fix, bugfix, perf, refactor, test, tests
patchAll: false
skipInvalidTags: false
Comparing against latest tag: x/v1.0.0
/home/runner/work/_actions/ietf-tools/semver-action/v1.5.1/dist/index.js:4998
const error = new requestError.RequestError(toErrorMessage(data), status, {
^

RequestError [HttpError]: Not Found
at /home/runner/work/_actions/ietf-tools/semver-action/v1.5.1/dist/index.js:4998:21
at processTicksAndRejections (node:internal/process/task_queues:96:5)
at async main (/home/runner/work/_actions/ietf-tools/semver-action/v1.5.1/dist/index.js:31171:24) {
status: 404,

What am I doing wrong? If I omit the prefix i get "Latest tag is invalid (does not conform to semver)!"

So clearly the prefix does something...