My follow-up:
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[~] # head -n6 /etc/config/uLinux.conf
[System]
Model = TS-559
Internal Model = TS-559
Server comment =
Version = 4.2.6
Build Number = 20190322
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[~] # sh --version
GNU bash, version 3.2.57(2)-release (i686-pc-linux-gnu)
Copyright (C) 2007 Free Software Foundation, Inc.
I was finally able to test via vQTS 4.3.5 - my testing showed some manually-set bind parameters had no effect and were ignored.
I've found a few posts describing this same "scrolling-when-it-shouldn't" behavior going back almost 20 years - there seems to be no common cause. I'm out of ideas.