By the way, maybe I should add that both devices are GL.iNet GL-AR150.
Also, the configs are only minimally different from the defaults. The only option that could be a bit unusual is having 802.11r enabled.
And indeed, after disabling 802.11r, the bug occurs much less often. In fact, without 802.11r, I have not seen the bug for several restarts. I thought I saw the bug once even with 802.11r disabled, but I am not so sure anymore. I now did another dozen restarts (with 802.11r disabled), and the connection always works. Maybe the one time I thought I saw the bug I just wrote "ping" too quickly.
I enabled 802.11r again, and the bug appeared again after only one restart. It feels like it is not a coincidence.
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