Describe the bug

The Markdown preview is not working, because the wrong JBR is used (without JCEF support).
This is the error I get when launched from the terminal:
WARN - #com.intellij.ui.jcef.JBCefApp - JCEF runtime library is not a JBR module (Use JBR bundled with the IDE)

Some user had a similar problem and it was fixed by using a different JBR.
https://youtrack.jetbrains.com/issue/IJSDK-909

Steps To Reproduce

1. Launch a JetBrains product
2. Create a Markdown file
3. No preview is shown
4. If launched from terminal, the aforementioned warning should appear.

Expected behavior

Markdown preview should be working.

I also tested the Markdown preview with a JetBrains product installed from JetBrains Toolbox on Fedora Workstation 34, with default settings and default JBR and it is working fine there.