Hi @p_ vinay ,
Seems the custom field is not present in Create/Edit screen of the project issue type. Please add the field to the screen and retry.
i.e.
- Open the Project where the issue is happening.
- Go to Project Settings.
- Click on Screens
- Click on the name of your screen to expand. You should see something like the screen below:

- Click on the name of the screen next to Create issue/Edit Issue.
- Finally, add the missing field to the list. Make sure the field is added in View screen also.
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