3.0.0-alpha.6 why customRender not work : and image render not support

[danzf]

builder:(context) =>
context.element!.attributes["src"] != null &&
context.element!.attributes["src"]!.startsWith("/"):
networkImageRender(
mapUrl: (url) => "https://domian.com${url!}"),
in alpha 6 work some time ago, in now notwork

[Sub6Resources]

What exactly doesn't work? Are you seeing some sort of error message?