Hi Eliseo,
Thanks for your patience.
We are glad to announce that our Essential Studio 2021 Volume 1 release v19.1.0.54 is rolled out and is available for download under the following link.
We have resolved the reported issue “Pressing 'cmd+z' after deleting all contents deletes the first paragraph of the Rich Text Editor” with the package version 19.1.54.
Can you please upgrade your package to this version to resolve the issue on your end?
We thank you for your support and appreciate your patience in waiting for this release. Please get in touch with us if you would require any further assistance.
Regards,
Revanth