What I Expected Was?
Use Repeating Cmd Block to summon Skulkers in the same positon, and they teleport to everywhere the distance they can reach. In one word, they can fill a whole range, not as you see the screenshot they don't fill the whole range. They can produce a huge Shulker "block".
What's the Real Situation?
As you can see in the screenshot they're very loose, didn't produce a huge, close "block".
(Cuz I'm not Eng., I tried my best to describe this so there mustย beย sth not very accurate)
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@[Mod] violine1101
What kind of information do you want? Crash Report produced by holding F3 + C or what?
In its current form, the ticket does not make clear what the actual issue is, and from the screenshot I cannot see it either. As such, I'm unable to understand what you're trying to report.

Then I tried my best to do sth with this issue. I hope you can know what I want to mean QAQ...
@[Mod] violine1101

Well now Shulkers will tp @ 1ce when there R 2 close of em.
This is MC-183884