This is the third time I'm asking this question.
The last time, the answer came from someone described as "senior staff", and who only did a test with a Custom Module. Yes, Custom modules seem to work. NONE of the other Joomla modules -- not third party modules -- seem to work for me.
I'm on Joomla 4 using SPPB version 5.2.6.
I gotta get a solution to this problem since three of these modules appear on the home page of a site going live soon.