X_AI_CONTENT_UNSUPPORTED
Means
an image or document block the role, model or wire format cannot take
Typical cause
a media block in a non-user turn, to a model whose row omits the kind from input, or a source the wire format has no shape for
Fix
registerModel({ ...spec, input: ['image', 'document'] }) — or move the block into a user turn, or send the source the cause names