Check to use theme_blazy() specific for sub-modules theme_ITEM() (theme_slick_slide(), theme_splide_slide(), theme_gridstack_box(), etc.) contents with images/media along with their captions. This will be forced at blazy:3.x. You can help starting the migrations by enabling this to spot problems. If any issues, please disable and report for fixes, <a href=":url">read more</a>.