To simplify the question, the error scenario has been labeled as Scenario A, and the correct working scenario as Scenario B. The main concern is understanding why this discrepancy occurs.
Scenario A (error)
Step 1 https://i.sstatic.net/OyKUl.png
Step 2 & 3 https://i.sstatic.net/lrWqr.png
Scenario B (working)
Step 1 https://i.sstatic.net/B9nhT.png
Step 2 & 3 https://i.sstatic.net/I39fN.png
The objective is to comprehend why Scenario A fails to add the string of array/users to the database. Any insights would be greatly appreciated!