TypeError: m.render is not a function

GrapesJS version

• I confirm to use the latest version of GrapesJS

What browser are you using?

Chrome Version 105.0.5195.102 (Official Build) (x86_64)

Reproducible demo link

Describe the bug

How to reproduce the bug?

1. Create a new custom code block and add an iframe tag such as `<iframe src="http://localhost:8888/embed/shopping-list"></iframe>

What is the expected behavior? It inserts an iframe in the canvas

What is the current behavior? It errors out and fails

If is necessary to execute some code in order to reproduce the bug, paste it here below: No

Error log

TypeError: m.render is not a function
    at a.value (ComponentsView.js:86:23)
    at a.value (ComponentsView.js:39:10)
    at y (backbone.js:371:57)
    at m (backbone.js:356:19)
    at h (backbone.js:155:16)
    at u.trigger (backbone.js:346:5)
    at n._onModelEvent (backbone.js:1187:20)
    at y (backbone.js:372:58)
    at m (backbone.js:357:22)
    at h (backbone.js:155:16) {level: 'error'}

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