if you open up your

dendron.code-workspace

file, do you see any reference to Dendron Markdown Links in the bottom section under extensions/recommendations or extensions/unwantedRecommendations? If a reference exists, try removing it and see if the warning goes away:

json
    "extensions": {
        "recommendations": [
            "dendron.dendron-paste-image",
            "dendron.dendron-markdown-shortcuts"
        ],
        "unwantedRecommendations": [
            "dendron.dendron-markdown-notes",
            "shd101wyy.markdown-preview-enhanced",
            "kortina.vscode-markdown-notes",
            "mushan.vscode-paste-image"
        ]
    }