diff --git a/mobile/ios/BuzzPushKit/Sources/BuzzPushKit/BuzzPushNavigationTarget.swift b/mobile/ios/BuzzPushKit/Sources/BuzzPushKit/BuzzPushNavigationTarget.swift
index 2c6605719a..c6cb813648 100644
--- a/mobile/ios/BuzzPushKit/Sources/BuzzPushKit/BuzzPushNavigationTarget.swift
+++ b/mobile/ios/BuzzPushKit/Sources/BuzzPushKit/BuzzPushNavigationTarget.swift
@@ -37,11 +37,15 @@ public struct BuzzPushNavigationTarget: Codable, Equatable, Sendable {
     if tags.contains(where: { $0.count >= 2 && $0[0] == "broadcast" && $0[1] == "1" }) {
       return nil
     }
-    let parent = tags.last(where: { $0.count >= 4 && $0[0] == "e" && $0[3] == "reply" })?[1]
-    // Relay ingest ignores malformed reply IDs. An empty marker must not
-    // invalidate the otherwise usable channel/event navigation payload.
-    guard let parent, !parent.isEmpty else { return nil }
-    return parent
+    // Match relay ingest: the last valid 64-character ASCII-hex reply ID wins.
+    // A later malformed marker must not hide an earlier valid parent.
+    return tags.last(where: { tag in
+      guard tag.count >= 4, tag[0] == "e", tag[3] == "reply" else { return false }
+      let bytes = tag[1].utf8
+      return bytes.count == 64 && bytes.allSatisfy {
+        (48...57).contains($0) || (65...70).contains($0) || (97...102).contains($0)
+      }
+    })?[1]
   }
 
   /// Decodes a target without trusting other fields from the APNs payload.
diff --git a/mobile/ios/BuzzPushKit/Tests/BuzzPushKitTests/BuzzPushNavigationTargetTests.swift b/mobile/ios/BuzzPushKit/Tests/BuzzPushKitTests/BuzzPushNavigationTargetTests.swift
index 660945eb6d..c2bba98b7d 100644
--- a/mobile/ios/BuzzPushKit/Tests/BuzzPushKitTests/BuzzPushNavigationTargetTests.swift
+++ b/mobile/ios/BuzzPushKit/Tests/BuzzPushKitTests/BuzzPushNavigationTargetTests.swift
@@ -116,8 +116,24 @@ import Testing
 }
 
 @Test func `Thread destination keeps direct parent and broadcast semantics`() {
-  let tags = [["e", "outer-root", "", "root"], ["e", "direct-parent", "", "reply"]]
-  #expect(BuzzPushNavigationTarget.threadRootID(in: tags) == "direct-parent")
+  let parent = String(repeating: "a", count: 64)
+  let tags = [["e", "outer-root", "", "root"], ["e", parent, "", "reply"]]
+  #expect(BuzzPushNavigationTarget.threadRootID(in: tags) == parent)
   #expect(BuzzPushNavigationTarget.threadRootID(in: tags + [["broadcast", "1"]]) == nil)
   #expect(BuzzPushNavigationTarget.threadRootID(in: [["e", "outer-root", "", "root"]]) == nil)
 }
+
+@Test func `Last valid reply marker wins despite trailing malformed markers`() {
+  let first = String(repeating: "a", count: 64)
+  let last = String(repeating: "B", count: 64)
+  let invalidIDs = ["", "bad", String(repeating: "a", count: 63),
+    String(repeating: "a", count: 65), String(repeating: "g", count: 64),
+    String(repeating: "é", count: 64)]
+  for invalid in invalidIDs {
+    let invalidTag = ["e", invalid, "", "reply"]
+    #expect(BuzzPushNavigationTarget.threadRootID(in: [invalidTag]) == nil)
+    #expect(BuzzPushNavigationTarget.threadRootID(in: [
+      ["e", first, "", "reply"], ["e", last, "", "reply"], invalidTag,
+    ]) == last)
+  }
+}
diff --git a/mobile/ios/BuzzPushKit/Tests/BuzzPushKitTests/BuzzPushNotificationResolverTests.swift b/mobile/ios/BuzzPushKit/Tests/BuzzPushKitTests/BuzzPushNotificationResolverTests.swift
index 643cc050e4..8d8de632be 100644
--- a/mobile/ios/BuzzPushKit/Tests/BuzzPushKitTests/BuzzPushNotificationResolverTests.swift
+++ b/mobile/ios/BuzzPushKit/Tests/BuzzPushKitTests/BuzzPushNotificationResolverTests.swift
@@ -163,17 +163,20 @@ final class BuzzPushNotificationResolverTests: XCTestCase {
   }
 
   func testReplyNavigationUsesDirectParentAndKeepsExactEvent() throws {
+    let parent = String(repeating: "a", count: 64)
     let reply = event(id: "reply-id", content: "Reply preview", tags: [
       ["h", Self.channelID],
       ["e", "outer-root", "", "root"],
-      ["e", "direct-parent", "", "reply"],
+      ["e", parent, "", "reply"],
+      ["e", "bad", "", "reply"],
+      ["e", "", "", "reply"],
     ])
     let resolution = try XCTUnwrap(BuzzPushNotificationResolver.decodeResolution(
       events: [reply], community: community()
     )?.0)
     let target = try XCTUnwrap(resolution.navigationTarget)
     XCTAssertEqual(target.eventID, "reply-id")
-    XCTAssertEqual(target.userInfoValue["thread_root_id"], "direct-parent")
+    XCTAssertEqual(target.userInfoValue["thread_root_id"], parent)
   }
 
   func testNavigationKeepsTopLevelAndBroadcastMessagesInChannel() throws {