Text editor webpart Images are disappearing after site page edit

[DJoshi2302]

Hi Team,

We are working on one of the migration project, where we are migrating contents from classic ASP (Static Content) into SharePoint Online. We are parsing the ASP static content and sanitizing it to have only HTML tags and injecting that using the CSOM into SharePoint online. 

After migrating the pages it is looking good but if we edit the page then images are disappearing  

[#2]

@DJoshi2302 

Are those images stored in same SharePoint site? 

Are you using modern experience pages with Text web part in SharePoint?

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