In 4.4 and 5.0 item configuration is the same, but the end result is quite different.
In 4.4. you can see item being successfully calculated, while in 5.0 it throws I assume an expected error.
(See attached screenshots)
According to documentation text items cannot be used in calculated items, but in 4,4 it differs. What is the correct expected result?

Best Regards,
Aleksandrs