How to tell Gitversion to increment versions on every merge on dev?

Question

We create our features on feature/* branches and we make Pull Requests on Azure DevOps to merge them on dev branch.

On the PR, we have a template that suggest to choose between Fix, Minor or Major. Selecting one of the options will trigger the corresponding commit (+semver: (major|minor|patch)) in the build validation pipeline as we are using GitVersion.

The template in the PR:

## Type of update 
    - [ ] Fix
    - [ ] Feature
    - [ ] Major Change

The build validation pipeline

trigger:
- none

pool:
  vmImage: ubuntu-latest

## Job to calculate semantic version
jobs:
  - job: CalculateVersion
    displayName: Semantic versioning

    steps:
      # Checkout with persist credentials
      - checkout: self
        fetchDepth: 0
        persistCredentials: true

      # Install GitVersion
      - task: gitversion/setup@0
        displayName: Install GitVersion
        inputs:
          versionSpec: '5.x'

      # Retrieve Pull Request Description
      - task: PullRequestDescription@0
        name: RetrievePullRequestDescription
        displayName: Retrieve Pull Request description
        inputs:
          action: 'view'
          outputVariable: 'PullRequest.DescriptionContent'
          isOutput: true
          stripIdentifiers: false

      # Add git commit message that will be picked up by GitVersion ("+semver: patch/minor/major")
      # Depending on the Pull Request description, where the developer has marked the type of change
      - task: PowerShell@2
        displayName: Add git commit message for SemVer
        inputs:
          targetType: inline
          script: |
            Write-Host "Configuring git author info.." -ForegroundColor Cyan
            git config user.email "Azure DevOps pipeline"
            git config user.name "[email protected]"
            Write-Host "Doing git checkout..." -ForegroundColor Cyan
            git checkout -b $("$(System.PullRequest.SourceBranch)".replace('refs/heads/', ''))
            Write-Host "Checking Pull Request description..." -ForegroundColor Cyan
            $PRdesc = "$(RetrievePullRequestDescription.PullRequest.DescriptionContent)"
            if ($PRdesc -match '(\[x\] \bFix\b)') {
              Write-Host "Adding git (empty) commit message to mark this branch as a 'patch' SemVer increment." -ForegroundColor Cyan
              git commit -a -m "+semver: patch [skip azurepipelines]" --allow-empty
            } elseif ($PRdesc -match '(\[x\] \bFeature\b)') {
              Write-Host "Adding git (empty) commit message to mark this branch as a 'minor' SemVer increment." -ForegroundColor Cyan
              git commit -a -m "+semver: minor [skip azurepipelines]" --allow-empty
            } elseif ($PRdesc -match '(\[x\] \bMajor Change\b)') {
              Write-Host "Adding git (empty) commit message to mark this branch as a 'major' SemVer increment." -ForegroundColor Cyan
              git commit -a -m "+semver: major [skip azurepipelines]" --allow-empty
            } else {
              Write-Host "##vso[task.LogIssue type=error;]Please select the type of change in the Pull Request description, and Re-queue the validation." -ForegroundColor Cyan
              $PRdesc
              exit 1
            }
            Write-Host "Doing git push.." -ForegroundColor Cyan
            git push -f --set-upstream origin $("$(System.PullRequest.SourceBranch)".replace('refs/heads/', ''))
            Write-Host "Done." -ForegroundColor Cyan

      # Determine the semantic version
      - task: gitversion/execute@0
        displayName: Determine SemVer
        inputs:
          useConfigFile: True
          configFilePath: ".azuredevops/gitversion.yml"
          updateAssemblyInfo: true

Gitversion.yml file used by the powershell task in the validation pipeline:

next-version: 1.0
assembly-versioning-scheme: MajorMinorPatch
assembly-file-versioning-scheme: MajorMinorPatchTag
assembly-informational-format: '{InformationalVersion}'
mode: ContinuousDeployment
increment: Inherit
continuous-delivery-fallback-tag: ci
tag-prefix: '[vV]'
major-version-bump-message: '\+semver:\s?(breaking|major)'
minor-version-bump-message: '\+semver:\s?(feature|minor)'
patch-version-bump-message: '\+semver:\s?(fix|patch)'
no-bump-message: '\+semver:\s?(none|skip)'
legacy-semver-padding: 4
build-metadata-padding: 4
commits-since-version-source-padding: 4
commit-message-incrementing: Enabled
commit-date-format: 'yyyy-MM-dd'
# ignore:
#   sha: []
#   commits-before: yyyy-MM-ddTHH:mm:ss
merge-message-formats: {}
branches:
  main:
    regex: ^main$
    mode: ContinuousDelivery
    tag: ''
    increment: Patch
    prevent-increment-of-merged-branch-version: true
    track-merge-target: false
    tracks-release-branches: false
    is-release-branch: false
  feature:
    regex: ^feature?[/-]
    mode: ContinuousDeployment
    tag: useBranchName
    increment: Inherit
    prevent-increment-of-merged-branch-version: false
    track-merge-target: false
    tracks-release-branches: true
    is-release-branch: false
  hotfix:
    regex: ^hotfix(es)?[/-]|^bugfix(es)?[/-]|^fix?[/-]
    mode: ContinuousDelivery
    tag: patch
    increment: Patch
    prevent-increment-of-merged-branch-version: false
    track-merge-target: false
    tracks-release-branches: false
    is-release-branch: false
  develop:
    regex: ^dev$
    mode: ContinuousDeployment
    prevent-increment-of-merged-branch-version: false
    track-merge-target: false
    tracks-release-branches: false
    is-release-branch: true
    pre-release-weight: 1000

Question: Currently, every merge of feature/* into dev branch will increment (minor, major or patch, according to the checked box in the Pull Request's description) based on the last version of main. How can we make it increment based on the last version made on the dev branch instead ?

Expected flow:

Actual flow: