DefaultWysiwygConverter class, convertXHtmlToWikiMarkup method image link in HTML doesn't show up in Wiki Output

Jira Development Jira Server
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We have a custom Integration that creates Jira issue from Salesforce Custom Object. For one RichText Field, to convert HTML to WikiMarkup, images do not come across in Wiki Output.
I’m using DefaultWysiwygConverter class, convertXHtmlToWikiMarkup method.