Vtiger 7: While creatinga SMS Task in Workflows, on selection of the Field for the Text, field token does not come in Text field

Steps to reproduce:

Create a workflow and add a SMS task. For Example for module Organization (renamed to Clients in screenshots)

By default in the Field dropdown "Client Name" is the first option.

Click on the Field dropdown and select the First Field "Client Name":

It is expected that the field token to come in the Text field, but it does not

We have to fist some other field, and then select the First field to get its token in the Text field.

I guess this is something related to onChange event which is not being handled properly.