Business Central extension ClientAddIns shows up as _Exclude_ClientAddins_ what does it do?

When I upgraded and installed all the standard extensions, there is one that does not show up in Extensions Management, and I had to manually sync and install it.

Does anyone know what it does and why it does not show up?

I ran into this when I was copying a company from my upgrade to a Cronus originated database - all the tables and extensions have to be the same for copy company from one database to another to work.

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