Template serializer changing "OneColumnVerticalSection" to "OneColumn"

[PedroMordeP]

I have an issue when using the following commands without doing anything else, just reading and saving, it converts my section type from "OneColumnVerticalSection" to "OneColumn" and leading to provisioning error of Index out off range when setting the web parts to the second column.

        $templateFilePath = "c:\PathToTemplate.xml"
 
        $mainTemplate = Read-PnPSiteTemplate -Path $templateFilePath
        Save-PnPSiteTemplate -Template $mainTemplate -Out $templateFilePath -Force

My template has a page with the following section.
This happens when I have the "CallToAction" web parts.
If I remove them, the Type remains as "OneColumnVerticalSection"

          <pnp:Section Order="1" Type="OneColumnVerticalSection" VerticalSectionEmphasis="Soft">
              <pnp:Controls>
                <pnp:CanvasControl WebPartType="CallToAction" JsonControlData="..." ControlId="df8e44e7-edd5-46d5-90da-aca1539313b8" Order="1" Column="1" />
                <pnp:CanvasControl WebPartType="CallToAction" JsonControlData="..." ControlId="df8e44e7-edd5-46d5-90da-aca1539313b8" Order="2" Column="1" />
                <pnp:CanvasControl WebPartType="CallToAction" JsonControlData="..." ControlId="df8e44e7-edd5-46d5-90da-aca1539313b8" Order="3" Column="1" />
                <pnp:CanvasControl WebPartType="Custom" JsonControlData="..." ControlId="7a8004cb-8a1d-4fee-831d-2780ba29554c" Order="1" Column="2" />
                <pnp:CanvasControl WebPartType="Custom" JsonControlData="..." ControlId="311d802e-8e1d-4c43-989a-92a8b321e207" Order="2" Column="2" />
                <pnp:CanvasControl WebPartType="Custom" JsonControlData="..." ControlId="0f654c60-160f-4f66-bc67-f693d244b447" Order="3" Column="2" />
              </pnp:Controls>
            </pnp:Section>

I tried to debug this and ended up in the ..PnP.Framework\src\lib\PnP.Framework\Provisioning\Providers\Xml\XmlPnPSchemaBaseSerializer.cs
But still can't understand where this change is being made

Does someone have a clue why this happens and where?

[PedroMordeP]

After further debugging, an error is thrown when trying to parse the value

After finding this, the missing enums were added to the ProvisioningSchema-2022-09.cs

Can those enums be added there? Or are there other ways to do this?

@czullu this may be related to what was worked to support the flexible layouts?

FYI: @jansenbe