When a Shrieker begins shrieking, there is a delay of about 4 seconds before the darkness effect takes place and then the Warden starts crawling out of the ground several seconds later. However, if a Shrieker that is in the process of summoning is broken during the shriek, darkness falls immediately, and the Warden begins to appear without any delay at all.

Is this intentional?  Shouldn't it take exactly the same time to appear, regardless of the fate that befalls the Shrieker that summoned it?

Here's a video illustrating the phenomenon.  He corrected himself about the "aggro" part, but I sadly didn't get that part of the clip.  The Warden isn't "aggro" at that point, it just appears way earlier than it would have had he not broken the Shrieker.  The user in the video is playing on version 1.20.1, but I was able to reproduce this in a 1.20.2 world.