Prerelease versioning with 2 protected prerelease branches and 1 release branch

[L-U-C-K-Y]

Current behavior

Hi all

I have set it semantic release on our GitLab repository with the following setup:

• production (release to prod environment)
• beta (prerelease to beta environment)
• alpha (prerelease to alpha environment)

The desired branching model is:

1. developers create a feat/xyz branch from alpha (alpha acts as the master branch in that sense).
2. afterwards, they merge the feat/xyz branch into alpha, test.
3. merge alpha into beta, test.
4. beta into production

While most parts of it work, I encounter wrong versions along the process, here an example:

1. 1.0.0 - initial commit on the production branch
2. fix/xyz (no release/prerelease)
3. 1.0.1-alpha.1 - merge fix/xyz into alpha
4. 1.0.1-beta.1 - merge alpha into beta
5. 1.0.1 - merge beta into production
6. feat/xyz2 (no release/prerelease)
7. 1.1.0-alpha.1 - merge feat/xyz2 into alpha
8. 1.1.0-beta.1 - merge feat/xyz2 into beta
9. 1.1.0 - merge beta into production
10. feat/xyz3 (no release/prerelease)
11. 1.1.0-alpha.2 - merge feat/xyz3 into alpha --> should be 1.2.0-alpha.1 (or 1.1.1-alpha.1 if it's a fix)

Expected behavior

• 1.1.0-alpha.2 --> should be 1.2.0-alpha.1

I am open for changes to the branching model, the only requirement is that deployments to alpha, beta and production are possible.

Environment

semantic-release config in package.json:

"release": {
    "branches": [
      "+([0-9])?(.{+([0-9]),x}).x",
      "production",
      {
        "name": "beta",
        "prerelease": true
      },
      {
        "name": "alpha",
        "prerelease": true
      }
    ],
    "plugins": [
      "@semantic-release/commit-analyzer",
      "@semantic-release/release-notes-generator",
      [
        "@semantic-release/gitlab",
        {
          "gitlabUrl": "https://gitlab.com"
        }
      ],
      [
        "@semantic-release/npm",
        {
          "npmPublish": false
        }
      ]
    ],
    "verifyConditions": [
      "@semantic-release/gitlab"
    ],
}

Versions:

    "@semantic-release/commit-analyzer": "^8.0.1",
    "@semantic-release/gitlab": "^6.0.3",
    "@semantic-release/npm": "^7.0.5",
    "@semantic-release/release-notes-generator": "^9.0.1",
    "semantic-release": "^17.0.4",