Data flow problem with Named Formulas

To repro, use the following code in the REPL project to test:

_engine.UpdateVariable("CELL00", FormulaValue.New(0));
_engine.SetFormula("ROW0", expr: "[ CELL00 ]", onUpdate: null);
_engine.SetFormula("COLUMN0", expr: "[ CELL00 ]", onUpdate: null);
_engine.SetFormula("BOX00", expr: "[ CELL00 ]", onUpdate: null);
_engine.SetFormula("CELLSUM", expr: "Sum( CELL00, First(ROW0).Value, First(COLUMN0).Value, First(BOX00).Value )", onUpdate: null);

If you now increment CELL00, with:

Set(CELL00, 1)

You'll notice that CELLSUM is actually "2" instead of "4". But ROW0, COLUMN0 and BOX00 all have correct values.
If you keep increasing CELL00 you'll find the CELLSUM will lag behind the values of some of the named formulas.

Instead of Sum you can make a custom function to see it in more detail.

EDIT: this is not an issue in Power Apps, only in C# interpreter / RecalcEngine.

Start in the REPL project and reproduce the named-formula example through the C# interpreter/RecalcEngine, then compare CELLSUM with ROW0, COLUMN0, and BOX00 after incrementing CELL00. Trace the update flow through UpdateVariable, SetFormula, and Set, including the Sum expression. Done means CELLSUM reflects all four current values instead of lagging behind.