Adding special character in source mode removes html embed widget

[FilipTokarski]

📝 Provide detailed reproduction steps (if any)

1. Add html embed, click Edit source
2. Add special character

✔️ Expected result

Either special characters toolbar icon should be deactivated, or the character should be added to html source.

❌ Actual result

Html embed gets removed completely:

---

If you'd like to see this fixed sooner, add a 👍 reaction to this post.

[CKEditorBot]

There has been no activity on this issue for the past two years. We've marked it as stale and will close it in 30 days. We understand it may be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

[CKEditorBot]

There has been no activity on this issue for the past year. We've marked it as stale and will close it in 30 days. We understand it may still be relevant, so if you're interested in the solution, leave a comment or reaction under this issue.

[CKEditorBot]

We've closed your issue due to inactivity over the last year. We understand that the issue may still be relevant. If so, feel free to open a new one (and link this issue to it).