When working with certain fields, such as the HTML field, it's common to paste content from other websites, tools, and apps. Sometimes content added comes in with considerable HTML metadata, such as styling or formatting metadata, which can quickly surpass the 300KB field size limits "invisibly" without being noticed.
To notify you of this, we've added a new warning to notify users about potentially unexpected hidden content inside text fields.
In the admin UI, you'll see a yellow warning message like this under affected fields if we detect an abnormal amount of invisible text in it.