Flow variables not showing in Variable Expressions/Java Edit Variable

This seems like a bug. A flow variable produced by the previous node does not show in the next node’s list of variables, a Variable Expressions node. It’s also missing from the Java Edit Variable node list of variables. Specifically:

Outgoing node (Table Row to Variable) creates flow variable “HoursFromLastDate”.

The new flow variable shows up after executing the node in its Variable Output table and it has a value (21).

But the flow variable does not show in the next node, Variable Expression. It is not listed under “variables”

Same happens if I replace Variable Expression with Java Edit Variable. Still not listed.