can not set flexible to property compliance of vah264dec

[cfd new]

I made a pipeline to receive rtsp streaming with vah264dec compliance=flexible.The pipeline runs fine from command line. But there is an error when I use gstreamer code 
to build the pipeline in C/C++.GstElement * decoder = gst_element_factory_make( "vah264dec", "decoder");g_object_set( decoder, "compliance", "flexible", nullptr );

I got error message:
GLib-GObject-WARNING **: 10:10:33.535: value "((GstH264DecoderCompliance) 1907760221)" of type 'GstH264DecoderCompliance' is invalid or out of range for property 'compliance' of type 'GstH264DecoderCompliance'

This property setting is not documented anywhere.
This is on Ubuntu 22.04 and gstreamer 1.22.2.
   Joe

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