diff --git a/changelog.d/14890.bugfix b/changelog.d/14890.bugfix
new file mode 100644
index 000000000000..fe21277a9ee5
--- /dev/null
+++ b/changelog.d/14890.bugfix
@@ -0,0 +1 @@
+Thumbnail WebP images as WebP instead of JPEG, preserving transparency.