Here is how dpkg-maintscript-helper calls dpkg --compare-versions:
"""
[pid 10745] execve("/usr/bin/dpkg", ["dpkg", "--compare-versions", "--",
"le-nl", "1.0.36-1~"], [/* 47 vars */]) = 0
dpkg: error: --compare-versions takes three
arguments: <version> <relation> <version>
Type dpkg --help for help about installing and deinstalling packages [*];
Use 'apt' or 'aptitude' for user-friendly package management;
Type dpkg -Dhelp for a list of dpkg debug flag values;
Type dpkg --force-help for a list of forcing options;
Type dpkg-deb --help for help about manipulating *.deb files;
Options marked [*] produce a lot of output - pipe it through 'less' or 'more' !
[pid 10745] +++ exited with 2 +++
"""
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https://bugs.launchpad.net/bugs/1605052
Title:
snap-confine: dpkg --compare-versions error outputs during
installation from snapd/ubuntu-core-launcher upgrade
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