[BUG] Add-PnPPageWebPart Cannot Set Images for ImageGallery

Reporting an Issue or Missing Feature

Very similar to some earlier bugs related to the Image web part, I'm unable to add images to the Image Gallery web part. I can add an Image Gallery web part that pulls dynamically from a library, but our use case requires select images in a carousel.

Expected behavior

Images appear in the web part

Actual behavior

Spots for the images appear in the web part, but the images aren't visible.

Steps to reproduce behavior

I've tried both Add-PnPPageWebPart and Set-PnPPageWebPart, with the same results.

Add-PnPPageWebPart -Page $pageTitle -DefaultWebPartType ImageGallery -Section 1 -Column 1 -WebPartProperties $wpPropJson

Where images json in the $wpPropJson variable is like below. The galleryImgId looks like it might be generated when the images are added manually from the front end. I've tried a few different variations on this.

"images": [
          {  
            "siteId": "18e1477c-5056-4853-8951-15268c006a7f",  
            "webId": "d1628f6a-d25e-4641-94cd-2de258f3b1dc",  
            "listId": "{C2DF79CF-273B-4225-9DC4-86A907D46E2F}",  
            "id": "35707cf1-ef0d-49ae-abdd-72f2567a9051",  
            "title": "",  
            "isInList": true,  
            "description": "",  
            "altText": "",  
            "galleryImgId": "cccf24be-a78e-486b-ae1c-84c2296be446"  
          },  
          {  
            "siteId": "18e1477c-5056-4853-8951-15268c006a7f",  
            "webId": "d1628f6a-d25e-4641-94cd-2de258f3b1dc",  
            "listId": "{C2DF79CF-273B-4225-9DC4-86A907D46E2F}",  
            "id": "59d95cd0-47fe-42b7-803b-38cfbea2ffd2",  
            "title": "",  
            "isInList": true,  
            "description": "",  
            "altText": "",  
            "galleryImgId": "8af97428-7f0f-42b7-a1db-0f934623e52c"
          }  
        ]

What is the version of the Cmdlet module you are running?

2.2.0

Which operating system/environment are you running PnP PowerShell on?

• Windows
• Linux
• MacOS
• Azure Cloud Shell
• Azure Functions
• Other : please specify

Start with the Add-PnPPageWebPart and Set-PnPPageWebPart entry points and reproduce the ImageGallery case using the supplied $wpPropJson images structure. Compare the behavior with images added through the SharePoint front end, including the galleryImgId values. Done means selected images are visible in the Image Gallery web part rather than only showing image placeholders.