List gallery view doesn't show images, while standard list view does

AndyTuke1325 First of all check the src property value used for img tag in the gallery view JSON formatting.

Previously Microsoft was storing the images saved in "image" column to Site Assets library for all lists. Recently they made some changes and sometimes images are saved to attachments section of same list if attachments are enabled on the list. Check more details at:

1. SharePoint Online: All you need to know about New Image column type 
2. Fixed a issue that images could not be downloaded 

Also, while saving the image to list via Power Automate what is the body you are using? You have to pass the Unique ID column value of image from site assets library to image column in the list to get it working properly.

I have updated my blog (which uses PnP PowerShell) with this new update, check here: Add/Update image columns in SharePoint/Microsoft Lists using PnP PowerShell 

I have some other solutions to add/update image columns in the SharePoint list using CLI for Microsoft 365 and Power Automate as well. But Power Automate blogs are older and need updated version accordingly to update the Unique ID properly. However you can refer them here if you want:

1. Add an image to SharePoint Image columns using Power Automate 
2. Update image in SharePoint/Microsoft Lists Image columns using Power Automate 
3. Add/Update image columns in SharePoint lists using CLI for Microsoft 365 

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