I am not sure if this is directly a JCE issue or SP Page builder problem but am posting it on JoomShaper's forum as well (https://www.joomshaper.com/forum/question/5793) as the error only occurs when using SP Page Builder, but JCE Pro works fine creating normal Joomla articles.
When using JCE Pro 2.9.11 as default editor set in Global Configuration in Joomla 4.0 (stable, fresh install) with Helix Ultimate 2.0 (stable, fresh install) and SP Page Builder 3.7.12 Pro (latest version, J4.0 compatible), I'm having a problem when opening SPPB pages, with the following error: Call to undefined method Joomla\CMS\Document\HtmlDocument::addScriptVersion()
If I change the default editor back to TinyMCE, SPPB will work as normal and I don't have any issue editing or opening pages.
Thank you.