diff --git a/server/channels/app/post.go b/server/channels/app/post.go
index 2bb98a5b4a..3def93614a 100644
--- a/server/channels/app/post.go
+++ b/server/channels/app/post.go
@@ -489,7 +489,10 @@ func (a *App) handlePostEvents(c request.CTX, post *model.Post, user *model.User
 	}
 
 	a.Srv().Platform().InvalidateCacheForChannel(channel)
-	a.invalidateCacheForChannelPosts(channel.Id)
+	if post.IsPinned {
+		a.Srv().Store().Channel().InvalidatePinnedPostCount(channel.Id)
+	}
+	a.Srv().Store().Post().InvalidateLastPostTimeCache(channel.Id)
 
 	if _, err := a.SendNotifications(c, post, team, channel, user, parentPostList, setOnline); err != nil {
 		return err
diff --git a/server/channels/app/post_acknowledgements.go b/server/channels/app/post_acknowledgements.go
index 0ca509ef9d..d5c9f755f0 100644
--- a/server/channels/app/post_acknowledgements.go
+++ b/server/channels/app/post_acknowledgements.go
@@ -46,11 +46,9 @@ func (a *App) SaveAcknowledgementForPost(c request.CTX, postID, userID string) (
 	}
 
 	// The post is always modified since the UpdateAt always changes
-	a.invalidateCacheForChannelPosts(channel.Id)
+	a.Srv().Store().Post().InvalidateLastPostTimeCache(channel.Id)
 
-	a.Srv().Go(func() {
-		a.sendAcknowledgementEvent(model.WebsocketEventAcknowledgementAdded, acknowledgement, post)
-	})
+	a.sendAcknowledgementEvent(model.WebsocketEventAcknowledgementAdded, acknowledgement, post)
 
 	return acknowledgement, nil
 }
@@ -92,11 +90,9 @@ func (a *App) DeleteAcknowledgementForPost(c request.CTX, postID, userID string)
 	}
 
 	// The post is always modified since the UpdateAt always changes
-	a.invalidateCacheForChannelPosts(channel.Id)
+	a.Srv().Store().Post().InvalidateLastPostTimeCache(channel.Id)
 
-	a.Srv().Go(func() {
-		a.sendAcknowledgementEvent(model.WebsocketEventAcknowledgementRemoved, oldAck, post)
-	})
+	a.sendAcknowledgementEvent(model.WebsocketEventAcknowledgementRemoved, oldAck, post)
 
 	return nil
 }
diff --git a/server/channels/app/reaction.go b/server/channels/app/reaction.go
index 449ed3aab8..2a46fda2af 100644
--- a/server/channels/app/reaction.go
+++ b/server/channels/app/reaction.go
@@ -71,7 +71,7 @@ func (a *App) SaveReactionForPost(c request.CTX, reaction *model.Reaction) (*mod
 	}
 
 	// The post is always modified since the UpdateAt always changes
-	a.invalidateCacheForChannelPosts(post.ChannelId)
+	a.Srv().Store().Post().InvalidateLastPostTimeCache(channel.Id)
 
 	pluginContext := pluginContext(c)
 	a.Srv().Go(func() {
@@ -144,7 +144,7 @@ func (a *App) DeleteReactionForPost(c request.CTX, reaction *model.Reaction) *mo
 	}
 
 	// The post is always modified since the UpdateAt always changes
-	a.invalidateCacheForChannelPosts(post.ChannelId)
+	a.Srv().Store().Post().InvalidateLastPostTimeCache(channel.Id)
 
 	pluginContext := pluginContext(c)
 	a.Srv().Go(func() {