When setting Insert-View button to active, the CKEditor5 toolbar vanishes when editing the Textformat

Please provide more information:

1. What was the previous version of Drupal you were using before upgrade to 10.3.1.
2. What was the previous version of the module you were using before upgrade to 2.0.0-alpha3
3. Do you see any errors in developer console of the browser (the console appears when you do right click on any element of the page and then click on "Inspect" menu item, the developer console has "Console" tab. It would be helpful to see whether there are any errors there, and if possible, add the screenshots to the issue)?

Thanks for the hint to the console. I've found the culprit. Loading of adv/is/build/insert view adv.js was blocked by my adblocker.
After disabling the adblocker the page loaded with the insert_view button shown. Clicking on that button worked as expected.
Maybe the js-file should be renamed if it triggers adblocker.

Yes, there is already an issue about the ad blocker, so it seems that I have to revisit it and try to change the JS file name. I will close this one as a duplicate