NEW: The monthly bug threads have been pretty short in the recent past, so let's try to span a few months instead to avoid fragmentation. We will start a new thread in 2020.
The posting rules are as always:
Apparently, LabVIEW 2019 moved the expression node to the scripts palette, with the collateral damage that it is no longer accessible in LabVIEW Base.
(...even though the help still states that is should be available in base while script& formula palette is only available in full).
The number of the filed Bug Report is 351083.
However you need internal access to enter the site and watch the ticket.
Please don't uncross the wires, just change the documentation. Otherwise codes that work correctly now will stop working.