Option --fields not working on some items

Hey davidmartos96 ! Thanks for reaching out to us!

Let's try to get to the bottom of this.
For starters, can you let us know what fields you would expect to see in the human-readable output? From the overview you provided and the additional information, I reckon the fields of your item are password, source and agree, is this correct?
Secondly, can you please let us know if the json format of your item (op item get ITEM --format json), as well as the values returned by op read command (op read op://vault-name/item-name/field-name) are correct, and correspond to your expectations? This will help us determine is there is a problem in the item parsing for the human friendly output.
Thirdly, can you please check the item in 1Password for Linux, both in view and in edit mode, and confirm it looks as you'd expect it? This will help us determine if your item got malformed, in any way that could show in other clients as well.
Lastly, have you experienced this problem with any other items?

I am looking forward to hearing from you.

Best,
Horia