I’ve tried but I can’t replicate it here. I suspect meta uses the default values for max_image_width (690) and max_image_height(500). My max width is set to 350 and max height to 200.
That’s highlighted another problem. As a test I tried changing my sizes back to the defaults of 690 and 500, and whilst the values in the settings now show 690x500 when I upload images they are still resized to the old 350x200 maximum sizes. I’ve tried restarting Discourse and that hasn’t brought the default values into use.