Load more does not work correctly in a table that is tied to an external object made available via SF connect. In my case, I have an external object that has 9 records but on the model, I have set to initially load 5 records. So after page load, the table had five records displayed and shows 5+.  After clicking “load more”, I see 5 records and the record count is 5.

For this specific case, if I set the model to initially load 10, then the table has 9 records displayed with a record count of 9 and no “load more” button.