Are the following plugins Joomla 4 ready?

• System - SP PageBuilder
• System - SP Page Builder Pro Updater

I ran a Joomla 4 readiness check and these two plugins were highlighted as having "Potential Upgrade Issues".

Having waited until lots of other people have already migrated to Joomla 4, I am hoping issues like these will be something that you can tell me has already been resolved.

BTW I tried SPPB4 a few months ago and the trial did not go well. I decided to stick with SPPB3 for now but I was wondering if you have a date in mind when will you stop updating and supporting SPPB 3?