Why check parent element import source match child's import source

[zx013]

When I use web.module_from_url to load two js module, but I cannot use two component at the same time. It will cause error blew.
bundle.min.js:4 Parent element import source {"source":"/static/bundle.min.js","sourceType":"URL"} does not match child's import source {"source":"/static/bundle02.min.js","sourceType":"URL"}
So I saw source code, then I found createImportSourceElement func in reactpy-vdom.tsx.

  if (
      !isImportSourceEqual(props.currentImportSource, props.model.importSource)
    ) {
      console.error(
        "Parent element import source " +
          stringifyImportSource(props.currentImportSource) +
          " does not match child's import source " +
          stringifyImportSource(props.model.importSource),
      );
      return null;
    }

I do not know why check this?

[Archmonger]

We currently do not support mix-and-matching components from different import sources. Some changes will be needed to support this safely. This feature will come in a future update.

• See Improve support for JavaScript component children #1262