why bash completion sometimes doesn't work?

From	Long Wind <longwind2@yahoo.com>
Newsgroups	linux.debian.user
Subject	why bash completion sometimes doesn't work?
Date	2022-01-03 06:30 +0100
Message-ID	<DBo4V-4oV-1@gated-at.bofh.it> (permalink)
References	<DBo4V-4oV-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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when i type "ifdown wl" and press Tab, it shall complete it with full device name wlx12345
i believe it's taken from /etc/network/interfaces
but sometimes it doesn't work in buster

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why bash completion sometimes doesn't work? Long Wind <longwind2@yahoo.com> - 2022-01-03 06:30 +0100
  Re: why bash completion sometimes doesn't work? Greg Wooledge <greg@wooledge.org> - 2022-01-03 13:30 +0100
    Re: why bash completion sometimes doesn't work? Richmond <richmond@criptext.com> - 2022-01-03 15:50 +0100
    Re: why bash completion sometimes doesn't work? Long Wind <longwind2@yahoo.com> - 2022-01-03 21:20 +0100
      Re: why bash completion sometimes doesn't work? Greg Wooledge <greg@wooledge.org> - 2022-01-03 21:30 +0100
      Re: why bash completion sometimes doesn't work? David Wright <deblis@lionunicorn.co.uk> - 2022-01-03 22:50 +0100
        Re: why bash completion sometimes doesn't work? Long Wind <longwind2@yahoo.com> - 2022-01-04 01:00 +0100
          Re: why bash completion sometimes doesn't work? Greg Wooledge <greg@wooledge.org> - 2022-01-04 03:30 +0100
            Re: why bash completion sometimes doesn't work? Long Wind <longwind2@yahoo.com> - 2022-01-04 03:50 +0100
              Re: why bash completion sometimes doesn't work? Greg Wooledge <greg@wooledge.org> - 2022-01-04 04:00 +0100
            Re: why bash completion sometimes doesn't work? David Wright <deblis@lionunicorn.co.uk> - 2022-01-04 20:40 +0100

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