I hope you are having a nice day.
The new issue view uses Markdown formatting instead of Markup and you are correct to say that it renders at the same time it is applied instead of render after the text is saved, as the markup of the old view did before.
Unfortunately, there's no way to change this functionality, however, I must confess that I don't see a scenario where this change would be useful.
If this is useful for you in any way, please feel free to open a new feature request on https://jira.atlassian.com/.
For more information about the new renderer, you can check the section New Atlassian editor in the documentation below:
Let me know if this information helps.
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