why bash completion sometimes doesn't work?

To: Debian-user Mailing List <debian-user@lists.debian.org>
Subject: why bash completion sometimes doesn't work?
From: Long Wind <longwind2@yahoo.com>
Date: Mon, 3 Jan 2022 05:25:31 +0000 (UTC)
Message-id: <[🔎] 1209326002.536832.1641187531299@mail.yahoo.com>
References: <1209326002.536832.1641187531299.ref@mail.yahoo.com>

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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