All blocks are vertically squished – no spacing

In the editor, if PublishPress blocks plugin is active, all the blocks in the editor have a 0 bottom margin. This is what I see in the inspector:

body.advgb-editor-width-large:not(.advgb-editor-width-default) #editor .edit-post-visual-editor__post-title-wrapper>.wp-block, body.advgb-editor-width-large:not(.advgb-editor-width-default) #editor .block-editor-writing-flow>.block-editor-block-list__layout>.wp-block {
    max-width: 75%;
    width: 75%;
    margin: 0 auto;
    margin-top: 0px;
    margin-right: auto;
    margin-bottom: 0px;
    margin-left: auto;
}

If I disable the plugin, things are spaced out nicely, and this is affecting all blocks in the editor, not just PublishPress blocks.