For the system spec, see below.
After updating to 2.1.0, publisher won't update page numbering for books anymore. I can reproduce it with new documents. Here's how:
Create new document (I used A4, no changes)
Save it (e.g. "A4_1")
Create another new document (A4)
Save it (e.g. "A4_2")
Create a new book
Add both new documents
You will see both chapter files with their page numbers
First: 1-10
Second: 11-20
Now drag&drop the second to first place, they won't get the page numbers renewed:
First: 11-20
Second: 1-10
You can click the renew numbering button, but nothing will happen
I also attached the created docs and book for your reference.
BTW: It was working in 2.0.4.
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Using latest released version 2.1.0 of Publisher
OS: Windows 10 22H2
Hardware acceleration: On
book.afbook A4_1.afpub A4_2.afpub