diff --git a/plugins/github/src/org/jetbrains/plugins/github/api/data/pullrequest/timeline/GHPRTimelineItem.kt b/plugins/github/src/org/jetbrains/plugins/github/api/data/pullrequest/timeline/GHPRTimelineItem.kt
index a7bfea13dd07..0539f2c17d58 100644
--- a/plugins/github/src/org/jetbrains/plugins/github/api/data/pullrequest/timeline/GHPRTimelineItem.kt
+++ b/plugins/github/src/org/jetbrains/plugins/github/api/data/pullrequest/timeline/GHPRTimelineItem.kt
@@ -15,7 +15,6 @@ PullRequestReview
 
 RenamedTitleEvent
 ClosedEvent | ReopenedEvent | MergedEvent
-ReferencedEvent
 AssignedEvent | UnassignedEvent
 LabeledEvent | UnlabeledEvent
 ReviewRequestedEvent | ReviewRequestRemovedEvent
@@ -50,12 +49,15 @@ DeployedEvent
 DeploymentEnvironmentChangedEvent
 PullRequestReviewThread
 PinnedEvent | UnpinnedEvent
-MentionedEvent
 SubscribedEvent | UnsubscribedEvent
 MilestonedEvent | DemilestonedEvent
 ConnectedEvent | DisconnectedEvent
 AutomaticBaseChangeSucceededEvent | AutomaticBaseChangeFailedEvent
  */
+/*IGNORE
+ReferencedEvent
+MentionedEvent
+ */
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "__typename", visible = true,
               defaultImpl = Unknown::class)
 @JsonSubTypes(
@@ -90,4 +92,8 @@ AutomaticBaseChangeSucceededEvent | AutomaticBaseChangeFailedEvent
 )
 interface GHPRTimelineItem {
   class Unknown(val __typename: String) : GHPRTimelineItem
+
+  companion object {
+    val IGNORED_TYPES = setOf("ReferencedEvent", "MentionedEvent")
+  }
 }
\ No newline at end of file
diff --git a/plugins/github/src/org/jetbrains/plugins/github/pullrequest/ui/timeline/GHPRTimelineMergingModel.kt b/plugins/github/src/org/jetbrains/plugins/github/pullrequest/ui/timeline/GHPRTimelineMergingModel.kt
index fd55d8431713..78587907b6a7 100644
--- a/plugins/github/src/org/jetbrains/plugins/github/pullrequest/ui/timeline/GHPRTimelineMergingModel.kt
+++ b/plugins/github/src/org/jetbrains/plugins/github/pullrequest/ui/timeline/GHPRTimelineMergingModel.kt
@@ -27,7 +27,7 @@ class GHPRTimelineMergingModel : AbstractListModel<GHPRTimelineItem>() {
     var added = false
     val hideUnknown = ApplicationManager.getApplication().let { !it.isInternal && !it.isEAP }
     for (item in items) {
-      if (hideUnknown && item is GHPRTimelineItem.Unknown) continue
+      if (item is GHPRTimelineItem.Unknown && (hideUnknown || item.__typename in GHPRTimelineItem.IGNORED_TYPES)) continue
       val merged = mergeIfPossible(lastItem, item)
       if (merged != null) {
         lastItem = merged