Executable Campaign

Does all program custom tokens will inherit to executable campaign if we choose 'Use Parent Campaign Token' as Yes?

I have used two flow step in the executable campaign as follows:

Change score  - {{my. program score}}

change data value  - attribute (campaign code) - {{my.campaign code}}

But I only see Change score update as per parent program token value, but change data value won't do any action.

I even tried a separate Executable campaign with mere Change data value flow step with above token, but I can see parent campaign result tab with campaign run details, but Executable campaign result shows null, data not updated in person record.

Can anyone help me what went wrong?