I upgraded from Joomla 3.10.x to Joomla 4.2.8 two days ago, and just created my first new hotspot after the upgrade.
I wasn't able to save, due to the fact there was no default value set in the column 'import_table' of the database jos_hotspots_marker.
So I changed the default value for that column from 'none' to 'null', and now it works.
Was that the right thing to do, or should I be doing something else?
(using hotspots professional 6.0.10)