diff --git a/Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsGalleryDataSource.swift b/Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsGalleryDataSource.swift
index 30b84475..6a013e62 100644
--- a/Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsGalleryDataSource.swift
+++ b/Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsGalleryDataSource.swift
@@ -64,7 +64,12 @@ struct AttachmentsGalleryDataSource: GalleryDataSource {
     }
     
     func galleryContentTransitionSourceView(forItemAt index: Int) -> UIView? {
-        collectionView.cellForItem(at: IndexPath(item: index, section: 0))
+        if let cell = collectionView.cellForItem(at: IndexPath(item: index, section: 0)) as? HostingCollectionViewCell {
+            // Use the hostView, because otherwise, the animation's changes to the source view opacity get clobbered by SwiftUI
+            cell.hostView
+        } else {
+            nil
+        }
     }
     
     private func fetchImageAndGIFData(assetID id: String) async -> (UIImage, Data?)? {
diff --git a/Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsSection.swift b/Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsSection.swift
index 60d3000a..bef0a6d0 100644
--- a/Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsSection.swift
+++ b/Packages/ComposeUI/Sources/ComposeUI/Views/Attachments/AttachmentsSection.swift
@@ -363,7 +363,7 @@ private final class IntrinsicContentSizeCollectionView: UICollectionView {
 }
 
 #if os(visionOS)
-private class HostingCollectionViewCell: UICollectionViewCell {
+final class HostingCollectionViewCell: UICollectionViewCell {
     private(set) var hostView: UIView?
     
     func setView<V: View>(_ view: V) {
@@ -382,7 +382,7 @@ private class HostingCollectionViewCell: UICollectionViewCell {
 }
 #else
 @available(iOS, obsoleted: 16.0)
-private class HostingCollectionViewCell: UICollectionViewCell {
+final class HostingCollectionViewCell: UICollectionViewCell {
     weak var containingViewController: UIViewController?
     
     @available(iOS, obsoleted: 16.0)