Add legacy block selector.

seedlet/assets/sass/vendors/jetpack/blocks/blog-posts/_style.scss

@@ -159,6 +159,7 @@
 // Block Style
 
 @include media(tablet) {
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid {
 
 		.article-section-title {

seedlet/style-rtl.css

@@ -4140,16 +4140,16 @@ img#wpstats {
 	}
 }
 
-.wp-block-newspack-blocks-homepage-articles .article-section-title,
-.wp-block-a8c-blog-posts .article-section-title {
+.wp-block-newspack-blocks-homepage-articles h2.article-section-title,
+.wp-block-a8c-blog-posts h2.article-section-title {
 	font-size: var(--heading--font-size-h4);
 	letter-spacing: var(--heading--letter-spacing-h4);
 	line-height: var(--heading--line-height-h4);
 	margin-bottom: calc(0.5 * var(--global--spacing-vertical));
 }
 
-.wp-block-newspack-blocks-homepage-articles .article-section-title + article,
-.wp-block-a8c-blog-posts .article-section-title + article {
+.wp-block-newspack-blocks-homepage-articles h2.article-section-title + article,
+.wp-block-a8c-blog-posts h2.article-section-title + article {
 	margin-top: 0;
 }
 
@@ -4360,9 +4360,11 @@ img#wpstats {
 }
 
 @media only screen and (min-width: 592px) {
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid .article-section-title,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid .article-section-title {
 		margin-right: calc(50% + (0.5 * var(--global--spacing-horizontal)));
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid article,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid article {
 		width: calc(50% - (0.5 * var(--global--spacing-horizontal)));
 		max-width: calc(50% - (0.5 * var(--global--spacing-horizontal)));
@@ -4371,22 +4373,28 @@ img#wpstats {
 		text-align: left;
 		clear: both;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid article .entry-meta,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid article .entry-meta {
 		justify-content: flex-end;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid article:nth-of-type(2n + 1),
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid article:nth-of-type(2n + 1) {
 		float: left;
 		text-align: right;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid article:nth-of-type(2n + 1) .entry-meta,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid article:nth-of-type(2n + 1) .entry-meta {
 		justify-content: flex-start;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid .more-link,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid .more-link {
 		display: inline-block;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid.wpnbha.is-grid > div,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid.wpnbha.is-grid > div {
 		display: inherit;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid button,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid button {
 		clear: both;
 		margin: var(--global--spacing-vertical) auto;

seedlet/style.css

@@ -4385,9 +4385,11 @@ img#wpstats {
 }
 
 @media only screen and (min-width: 592px) {
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid .article-section-title,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid .article-section-title {
 		margin-left: calc(50% + (0.5 * var(--global--spacing-horizontal)));
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid article,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid article {
 		width: calc(50% - (0.5 * var(--global--spacing-horizontal)));
 		max-width: calc(50% - (0.5 * var(--global--spacing-horizontal)));
@@ -4396,22 +4398,28 @@ img#wpstats {
 		text-align: right;
 		clear: both;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid article .entry-meta,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid article .entry-meta {
 		justify-content: flex-end;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid article:nth-of-type(2n + 1),
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid article:nth-of-type(2n + 1) {
 		float: right;
 		text-align: left;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid article:nth-of-type(2n + 1) .entry-meta,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid article:nth-of-type(2n + 1) .entry-meta {
 		justify-content: flex-start;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid .more-link,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid .more-link {
 		display: inline-block;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid.wpnbha.is-grid > div,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid.wpnbha.is-grid > div {
 		display: inherit;
 	}
+	.wp-block-newspack-blocks-homepage-articles.is-style-seedlet-alternating-grid button,
 	.wp-block-a8c-blog-posts.is-style-seedlet-alternating-grid button {
 		clear: both;
 		margin: var(--global--spacing-vertical) auto;