Issue with Prompt in Workflow: Fields Not Updating Correctly

I’m encountering an issue with my system where I’m unable to include the block prompt in a workflow. The workflow functions correctly without a prompt, but as soon as I add a prompt to display a message within the workflow, the necessary fields in the record fail to update.
It works this way:

It doesn’t work this way:

And that’s my trigger

I suspect this may be a bug. Could someone assist me with this issue? Thank you.