Formula fields are null when they are accessed in "on field input" workflow

Formula fields are null when they are accessed in "on field input" workflow

Hi,
I am trying to access a formula field (KGPerUnit) value in "on input" workflow of a field ($ Per KG).
The field KGPerUnit have value. But its value is returned as null when accessing in action. It is the same for any other formula field. Please look at the screenshot.

Anyone facing this issue? or Is it specific to my app only?
Zoho support is analyzing the issue for past 15 days. But no reply so far.