I've seen similar questions asked regarding Flutter and other applications, but to give some context, Google's Gboard just changed the way GIFs and emojis insert into the application, but it's unclear how to support it now.
The error above appears when using Gboard to insert an image into an HTML input. I assume there's some way to accept this, but there does not appear to be any documentation on this apart from the obscure change notes on Gboard that say they changed the way they do it.