Catalog zone incorrect logging

I changed the authoritative servers for a number of zones in my catalog zone; when my secondary server (BIND 9.13.4) picked up the new catalog zone, it logged the change incorrectly.

2018-11-23.11:59:05.410 general: info: catz: updating catalog zone 'catz.arpa.cam.ac.uk' with serial 1542974068
2018-11-23.11:59:05.410 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success
2018-11-23.11:59:05.411 general: info: catz: modifying zone '88.60.193.in-addr.arpa' from catalog 'catz.arpa.cam.ac.uk' - success

The zones that changed were the ones listed below, so named logged the correct number of zones, it just logged the wrong names...

I have checked that my secondary is correctly transferring maths.cam.ac.uk from its new servers, and 88.60.193.in-addr.arpa is still being transferred from its (different) upstreams. So it seems to be just the logging that is wrong.

damtp.cam.ac.uk
dpmms.cam.ac.uk
maths.cam.ac.uk
newton.cam.ac.uk
statslab.cam.ac.uk
16.111.131.in-addr.arpa
17.111.131.in-addr.arpa
18.111.131.in-addr.arpa
20.111.131.in-addr.arpa
24.111.131.in-addr.arpa
145.111.131.in-addr.arpa