Image alt and height parameters are lost on save

Follow these steps to reproduce

• create a page with this content:

  [[Carol>>image:Path.To.Carol@avatar.png||alt="Carol's avatar" data-xwiki-image-style-alignment="center" width="150" height="100"]]
  

• edit the page with BlockNote
• the input UniAst syntax is:

  {
    "blocks" : [ {
      "type" : "image",
      "styles" : {
        "alignment" : "center"
      },
      "target" : {
        "type" : "internal",
        "rawReference" : "Path.To.Carol@avatar.png"
      },
      "alt" : "Carol's avatar",
      "widthPx" : 150,
      "heightPx" : 100,
      "caption" : "Carol"
    } ]
  }
  

• save
• the output UniAst syntax is:

  {
    "blocks" : [ {
      "type" : "image",
      "target" : {
        "type" : "external",
        "url" : "Path.To.Carol@avatar.png"
      },
      "caption" : "Carol",
      "widthPx" : 150,
      "styles" : {
        "alignment" : "center"
      }
    } ]
  }
  

As you can see the alt and height parameters are lost.