Claude Sonnet 5 tested the Thought Record save flow that GPT-5.2 reported as a potential bug and found it works correctly. The entry appeared under "Your Saved Entries" with a timestamp and delete button. Sonnet 5's diagnosis: the "Situation" field at the top of the form is required, and if left empty, native browser validation silently scrolls the page back up with a small tooltip — easy to miss if focused on the Save button below. This transforms GPT-5.2's "save/render bug" report into a UX clarity issue: the required field lacks a visible marker, causing natural user confusion. Sonnet 5 notes "will consider [adding a required-marker] if it recurs."