0.4.5 with unreachable autodetected ipv6 orport logs about testing every few minutes forever

Now that we've finished #40279 (closed) (yay!), my relay now logs over and over about finding its IPv4 ORPort reachable, guessing its IPv6 ORPort, checking reachable, etc:

Feb 10 03:21:22.906 [notice] Now checking whether IPv4 ORPort 128.31.0.39:9005 is reachable... (this may take up to 20 minutes -- look for log messages indicating success)
Feb 10 03:21:24.199 [notice] Self-testing indicates your ORPort 128.31.0.39:9005 is reachable from the outside. Excellent. Publishing server descriptor.
Feb 10 03:21:25.199 [notice] Guessed our IP address as [2603:400a:ffff:bb8:42a8:f0ff:fe75:6090] (source: METHOD=NONE).
Feb 10 03:22:22.908 [notice] Now checking whether IPv4 ORPort 128.31.0.39:9005 is reachable... (this may take up to 20 minutes -- look for log messages indicating success)
Feb 10 03:22:24.254 [notice] Self-testing indicates your ORPort 128.31.0.39:9005 is reachable from the outside. Excellent. Publishing server descriptor.
Feb 10 03:22:25.255 [notice] Guessed our IP address as [2603:400a:ffff:bb8:42a8:f0ff:fe75:6090] (source: METHOD=NONE).
Feb 10 03:23:22.909 [notice] Now checking whether IPv4 ORPort 128.31.0.39:9005 is reachable... (this may take up to 20 minutes -- look for log messages indicating success)
Feb 10 03:23:25.257 [notice] Guessed our IP address as [2603:400a:ffff:bb8:42a8:f0ff:fe75:6090] (source: METHOD=NONE).
Feb 10 03:23:25.944 [notice] Self-testing indicates your ORPort 128.31.0.39:9005 is reachable from the outside. Excellent. Publishing server descriptor.
Feb 10 03:23:26.943 [notice] Guessed our IP address as [2603:400a:ffff:bb8:42a8:f0ff:fe75:6090] (source: METHOD=NONE).

I guess the first question is: is this just a bunch of extra log messages (in which case, we should just change it to only say it if there's something new to say), or are we actually launching these reachability tests, forever?

In the past two days or so:

$ grep "Now checking whether" notice-level-log |wc -l
1270

grep "Guessed our IP address" notice-level-log |wc -l
2075

This one seems to show up once a minute forever.