Describe the bug
Some RTE components (except text), disappear after the exploration is previewed. They aren't being deleted though, since they reappear once you try to edit the state text.

To Reproduce
Steps to reproduce the behavior:

1. Create a new exploration.
2. Add some RTE components (images, videos, links, etc.)
3. Preview the exploration.
4. Come back to the editor page, and the RTE components will disappear.

Observed behavior
The RTE components disappear.

Expected behavior
The RTE components shouldn't disappear.

Screenshots

Desktop (please complete the following information; delete this section if the issue does not arise on desktop):

• Browser: Chrome
• Browser-version: 94.0.4606.71