Commits ade370a4 and e3fb74f7 were reordered while merging, so this change got lost.
@@ -631,4 +631,5 @@ AVFilter ff_vf_deinterlace_vaapi = {
.inputs = deint_vaapi_inputs,
.outputs = deint_vaapi_outputs,
.priv_class = &deint_vaapi_class,
+ .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
};