diff --git a/packages/editor/CHANGELOG.md b/packages/editor/CHANGELOG.md
index 2d72126f377d9d..2716d965d14343 100644
--- a/packages/editor/CHANGELOG.md
+++ b/packages/editor/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Bug Fixes
+
+-   `Post Featured Image`: Fix `Set featured image` button's `box-shadow` transition to prevent border from flashing when focused.
+
 ## 14.10.0 (2024-10-16)
 
 ## 14.9.0 (2024-10-03)
diff --git a/packages/editor/src/components/post-featured-image/style.scss b/packages/editor/src/components/post-featured-image/style.scss
index a14c2ea73a63c1..30d5cb43403cdf 100644
--- a/packages/editor/src/components/post-featured-image/style.scss
+++ b/packages/editor/src/components/post-featured-image/style.scss
@@ -41,8 +41,6 @@
 .editor-post-featured-image__preview {
 	width: 100%;
 	padding: 0;
-	transition: all 0.1s ease-out;
-	@include reduce-motion("transition");
 	box-shadow: 0 0 0 0 var(--wp-admin-theme-color);
 	overflow: hidden; // Ensure the focus style properly encapsulates the image.
 	outline-offset: -#{$border-width};
@@ -66,6 +64,11 @@
 
 .editor-post-featured-image__toggle {
 	box-shadow: inset 0 0 0 $border-width $gray-400;
+
+	&:focus:not(:disabled) {
+		// Allow smooth transition between focused and unfocused box-shadow states.
+		box-shadow: 0 0 0 currentColor inset, 0 0 0 var(--wp-admin-border-width-focus) var(--wp-admin-theme-color);
+	}
 }
 
 .editor-post-featured-image__actions {