Problem with showing preview in the admin panel

[mnowakCode]

We upgraded our webshop to Magento 2.4.4 from Magento 2.3.7-p1, but for now, we have to use PHP 7.4. After this, I saw that preview in the admin panel doesn't show components that we added before the upgrade. Did you have this problem earlier?

Now it looks that:

Before the upgrade, it looked like that:

[m2-assistant[bot]]

Hi @mnowakCode. Thank you for your report. To speed up processing of this issue, make sure that you provided sufficient information.

Add a comment to assign the issue: @magento I am working on this

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