I believe there is a mistake in the following documentation page:
When it says:
The version numbers for Percona Server for MySQL 8.0.29-21 define the following information:
- Base version - the leftmost numbers indicate MySQL 8.0 version used as a base. An increase in base version resets the minor build version to 0.
- Minor build version - an internal number that increases by one every time Percona Server for MySQL is released.
In particular: "An increase in base version resets the minor build version to 0."
This is not correct, since that is monotonically increasing, as explained in the second point.