I am having serious problems with this as well. As a blogger the majority of my traffic comes from Pinterest. Pinterest pulls the title of the pin from the Alt Attributes field that was available in classic. With Gutenberg this field is no longer available. This is huge for SEO and all other programs that pull this info. This also causes in issue with YOAST SEO for posts (see screenshot). Can someone provide an update on when this fill be fixed? I have read 10 other threads about this issue and have not seen any resolution.
