(in 2.6.3) Bookmarks copied too many times when copying db

I have a database foo with 50 tables and 9 saved SQL bookmarks.
That is, SELECT COUNT(*) FROM pma_bookmark WHERE
dbase='foo'; returns 9.

If I use the Operations tab to make a copy of this database and call
it bar, then there are too many bookmarks for the new database:
SELECT COUNT(*) FROM pma_bookmark WHERE dbase='bar';
returns 450. Each of the 9 bookmarks is in there 50 times, once for
each table.

I observe this on both of our servers:

- PMA 2.6.2, MySQL 4.1.11, PHP 5.0.4, Apache 1.3.33, Mac OS X
10.3.9.

- PMA 2.6.1-pl3, MySQL 4.1.8, PHP 4.3.9, Apache 2.0.52, Gentoo
Linux.