bash command completion no longer working for "tmux attach -t <name>"

I don't really know much about how all these things work, so I'm not sure whether this is an issue in shells/bash-completion, shells/bash-completion-freebsd, shells/bash, sysutils/tmux, or potentially even something besides a port. So, I mean, if anyone actually knows the answer, I'd love to hear it, but hearing clues on how to investigate would be great.

Until recently -- this past week or so? -- I have for a long time been able to use command completion (in bash) with "tmux attach -t". For example, if I have tmux sessions named "fred", "wilma", "barney", and "betty", typing "tmux attach -t w" and then hitting the tab key would cause "tmux attach -t wilma". This no longer occurs.

Lots of other command completions -- including, for example, "tmux at<tab>" -- work fine. I have not noticed any command completions that aren't working except this one.

Thanks in advance for any help.
 
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