diff --git a/projects/packages/videopress/.phan/baseline.php b/projects/packages/videopress/.phan/baseline.php
index 4293758e30be3..b648b5c708a88 100644
--- a/projects/packages/videopress/.phan/baseline.php
+++ b/projects/packages/videopress/.phan/baseline.php
@@ -10,9 +10,9 @@
 return [
     // # Issue statistics:
     // PhanPluginDuplicateConditionalNullCoalescing : 20+ occurrences
-    // PhanUndeclaredProperty : 8 occurrences
     // PhanTypeMismatchArgumentProbablyReal : 7 occurrences
     // PhanTypeMismatchReturnProbablyReal : 7 occurrences
+    // PhanUndeclaredProperty : 7 occurrences
     // PhanTypeArraySuspicious : 6 occurrences
     // PhanTypeMismatchReturn : 6 occurrences
     // PhanUndeclaredClassMethod : 6 occurrences
@@ -42,7 +42,6 @@
         'src/class-block-editor-content.php' => ['PhanPluginDuplicateConditionalNullCoalescing'],
         'src/class-block-editor-extensions.php' => ['PhanRedundantCondition', 'PhanTypeMismatchReturnProbablyReal'],
         'src/class-data.php' => ['PhanPluginDuplicateConditionalNullCoalescing', 'PhanTypeArraySuspicious', 'PhanTypeMismatchReturn'],
-        'src/class-divi.php' => ['PhanUndeclaredProperty'],
         'src/class-initializer.php' => ['PhanNoopNew', 'PhanPluginDuplicateConditionalNullCoalescing'],
         'src/class-jwt-token-bridge.php' => ['PhanTypeMismatchReturn'],
         'src/class-plan.php' => ['PhanTypeMismatchReturnProbablyReal'],
diff --git a/projects/packages/videopress/changelog/fix-jetpack-handle_deprecation_notices_in_wild_found_during_14.4-a.3_deploy b/projects/packages/videopress/changelog/fix-jetpack-handle_deprecation_notices_in_wild_found_during_14.4-a.3_deploy
new file mode 100644
index 0000000000000..ad55ef30b341d
--- /dev/null
+++ b/projects/packages/videopress/changelog/fix-jetpack-handle_deprecation_notices_in_wild_found_during_14.4-a.3_deploy
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fixed
+
+Prevent deprecation notices on PHP 8.
diff --git a/projects/packages/videopress/src/class-divi.php b/projects/packages/videopress/src/class-divi.php
index bb3894c0f7089..7f3d180bdb3ac 100644
--- a/projects/packages/videopress/src/class-divi.php
+++ b/projects/packages/videopress/src/class-divi.php
@@ -25,6 +25,13 @@ class Divi {
 	 **/
 	private $running = false;
 
+	/**
+	 * VideoPress Divi Extension object.
+	 *
+	 * @var ?\VideoPress_Divi_Extension
+	 **/
+	private $vidi_extension;
+
 	/**
 	 * Initializes VideoPress/Divi integration.
 	 *
diff --git a/projects/plugins/jetpack/changelog/fix-jetpack-handle_deprecation_notices_in_wild_found_during_14.4-a.3_deploy b/projects/plugins/jetpack/changelog/fix-jetpack-handle_deprecation_notices_in_wild_found_during_14.4-a.3_deploy
new file mode 100644
index 0000000000000..8783c5b61c2a2
--- /dev/null
+++ b/projects/plugins/jetpack/changelog/fix-jetpack-handle_deprecation_notices_in_wild_found_during_14.4-a.3_deploy
@@ -0,0 +1,4 @@
+Significance: patch
+Type: other
+
+Prevent deprecation notices on PHP 8.
diff --git a/projects/plugins/jetpack/class.jetpack-post-images.php b/projects/plugins/jetpack/class.jetpack-post-images.php
index f34d62dbc8b5f..280a5a040d0a4 100644
--- a/projects/plugins/jetpack/class.jetpack-post-images.php
+++ b/projects/plugins/jetpack/class.jetpack-post-images.php
@@ -898,7 +898,7 @@ public static function fit_image_url( $src, $width, $height ) {
 
 		// If WPCOM hosted image use native transformations.
 		$img_host = wp_parse_url( $src, PHP_URL_HOST );
-		if ( str_ends_with( $img_host, '.files.wordpress.com' ) ) {
+		if ( $img_host && str_ends_with( $img_host, '.files.wordpress.com' ) ) {
 			return add_query_arg(
 				array(
 					'w'    => $width,
diff --git a/projects/plugins/jetpack/modules/carousel/jetpack-carousel.php b/projects/plugins/jetpack/modules/carousel/jetpack-carousel.php
index b7abb5fb2ab40..1a033b3e9bb41 100644
--- a/projects/plugins/jetpack/modules/carousel/jetpack-carousel.php
+++ b/projects/plugins/jetpack/modules/carousel/jetpack-carousel.php
@@ -818,6 +818,9 @@ class_exists( 'Jetpack_AMP_Support' )
 	 * @return string
 	 */
 	public function add_data_img_tags_and_enqueue_assets( $content ) {
+		if ( ! is_string( $content ) || $content === '' ) {
+			return '';
+		}
 		if (
 			class_exists( 'Jetpack_AMP_Support' )
 			&& Jetpack_AMP_Support::is_amp_request()
diff --git a/projects/plugins/jetpack/modules/markdown/easy-markdown.php b/projects/plugins/jetpack/modules/markdown/easy-markdown.php
index fb61aa1835917..6b0c2b4aa1e59 100644
--- a/projects/plugins/jetpack/modules/markdown/easy-markdown.php
+++ b/projects/plugins/jetpack/modules/markdown/easy-markdown.php
@@ -667,7 +667,7 @@ public function transform( $text, $args = array() ) {
 		 * @param string $text Content to be run through Markdown
 		 * @param array $args Array of Markdown options.
 		 */
-		$text = apply_filters( 'wpcom_markdown_transform_pre', $text, $args );
+		$text = apply_filters( 'wpcom_markdown_transform_pre', $text, $args ) ?? '';
 		// ensure our paragraphs are separated.
 		$text = str_replace( array( '</p><p>', "</p>\n<p>" ), "</p>\n\n<p>", $text );
 		// visual editor likes to add <p>s. Buh-bye.
diff --git a/projects/plugins/jetpack/modules/widgets/contact-info.php b/projects/plugins/jetpack/modules/widgets/contact-info.php
index a8bda55a5e5b8..d1f769b630771 100644
--- a/projects/plugins/jetpack/modules/widgets/contact-info.php
+++ b/projects/plugins/jetpack/modules/widgets/contact-info.php
@@ -163,7 +163,10 @@ public function widget( $args, $instance ) {
 				}
 			}
 
-			if ( is_email( trim( $instance['email'] ) ) ) {
+			if (
+				$instance['email']
+				&& is_email( trim( $instance['email'] ) )
+			) {
 				printf(
 					'<div class="confit-email"><a href="mailto:%1$s">%1$s</a></div>',
 					esc_html( $instance['email'] )