Action bound to abstract entity type is not present in OpenAPI output when using hidi to convert from CSDL

Describe the bug
When generating the OpenAPI description for Microsoft Graph Beta the offboard and cancelOffboard routes are not generated for the protectionUnit entity

Reproduction Steps

In a PowerShell terminal with dotnet 9

dotnet tool install --global Microsoft.OpenApi.Hidi
git clone https://github.com/microsoftgraph/msgraph-metadata.git
hidi transform --csdl .\msgraph-metadata\clean_beta_metadata\cleanMetadata.xml --output .\beta-enhanced-restore.yaml --co  --version "3.0" --metadata-version "beta" --log-level Trace --format yaml --settings-path .\msgraph-metadata\conversion-settings\openapi.json

Alternatively if you clone the internal AD-AggregatorService-Workloads you can use a smaller source csdl file:

hidi transform --csdl .\AD-AggregatorService-Workloads\Workloads\Microsoft.EnhancedRestore\override\schema-Prod-beta.csdl --output .\beta-enhanced-restore-3.1.yaml --co  --version "3.1" --metadata-version "beta" --log-level Trace --format yaml

When opening the newly created beta-enhanced-restore.yaml you will not find a path that includes /cancelOffboard

When examining the smaller CSDL fragment for the Microsoft.EnhancedRestore I can see that the impacted Actions are all bound to an abstract type.

      <EntityType Name="protectionUnitBase" BaseType="microsoft.graph.entity" Abstract="true" >
        <Property Name="policyId" Type="Edm.String" />
        <Property Name="status" Type="self.protectionUnitStatus" />
        <Property Name="createdDateTime" Type="Edm.DateTimeOffset" />
        <Property Name="createdBy" Type="microsoft.graph.identitySet" />
        <Property Name="lastModifiedDateTime" Type="Edm.DateTimeOffset" />
        <Property Name="lastModifiedBy" Type="microsoft.graph.identitySet" />
        <Property Name="protectionSources" Type="self.protectionSource" Nullable="false" />
        <Property Name="error" Type="microsoft.graph.publicError" />
        <Property Name="offboardRequestedDateTime" Type="Edm.DateTimeOffset" />
      </EntityType>
      <EntityType Name="protectionRuleBase" BaseType="microsoft.graph.entity" Abstract="true" >
        <Property Name="status" Type="self.protectionRuleStatus" />
        <Property Name="createdDateTime" Type="Edm.DateTimeOffset" />
        <Property Name="createdBy" Type="microsoft.graph.identitySet" />
        <Property Name="lastModifiedDateTime" Type="Edm.DateTimeOffset" />
        <Property Name="lastModifiedBy" Type="microsoft.graph.identitySet" />
        <Property Name="error" Type="microsoft.graph.publicError" />
        <Property Name="isAutoApplyEnabled" Type="Edm.Boolean" />
      </EntityType>
      <Action Name="run" IsBound="true">
        <Parameter Name="bindingParameter" Type="self.protectionRuleBase"/>
        <ReturnType Type="self.protectionRuleBase"/>
      </Action>
      <Action Name="deleteAndUnprotect" IsBound="true" >
        <Parameter Name="bindingParameter" Type="self.protectionRuleBase"/>
        <ReturnType Type="self.protectionRuleBase"/>
      </Action>
    <Action Name="offboard" IsBound="true">
      <Parameter Name="bindingParameter" Type="self.protectionUnitBase"/>
      <ReturnType Type="self.protectionUnitBase"/>
    </Action>
    <Action Name="cancelOffboard" IsBound="true" >
      <Parameter Name="bindingParameter" Type="self.protectionUnitBase"/>
      <ReturnType Type="self.protectionUnitBase"/>
    </Action>

Expected behavior
the /offboard and /cancelOffboard request URIs are described in the OpenAPI output.

Additional context
This is an issue preventing the generated SDKs for Microsoft Graph from including these requests.

Riproduci il problema con il comando Hidi usando l’input CSDL referenziato e conversion-settings/openapi.json. Confronta lo YAML generato con le azioni astratte di protectionUnitBase e verifica se /offboard e /cancelOffboard sono assenti. Il lavoro è completato quando entrambi gli URI delle richieste compaiono nell’output OpenAPI.