Some more details, this also happens when you write for the first time in the editor. Reproducible and video of the behavior are added as a reference below.

EDIT: A workaround is to replace empty paragraphs with a paragraph that has a non-breaking space when loading the content. For example, in this sample app that would look like this:

// in the component with the editor

void LoadContent() => Content = EditorStorage.Content.Replace("<p></p>", "<p>&nbsp;</p>").Replace("<p><br></p>", "<p>&nbsp;</p>");

in the service - so we have some mockup content (not needed for your test case):

public string Content { get; set; } = "<p>Para 1</p><p></p>";

Regards,
Marin Bratanov
Progress Telerik