.wp-block-image {
/*
From what I can tell the below are styles regularly used by themes
to fix the image block. I believe these should go into the block's
default styles. It's difficult to say how this will land, however
based on discussion found in (many) related issues here:
https://github.com/WordPress/gutenberg/issues/28923
https://github.com/WordPress/gutenberg/issues/29506
*/
text-align: center;
}