The offending commit has been introduced in util-linux v2.33, so the fix should go into Eoan (v2.34) and later.
$ git describe --contains 5454df9 v2.33-rc1~309^2~9
$ rmadison -a source util-linux util-linux | 2.20.1-1ubuntu3 | precise | source util-linux | 2.20.1-1ubuntu3.1 | precise-updates | source util-linux | 2.20.1-5.1ubuntu20 | trusty | source util-linux | 2.20.1-5.1ubuntu20.9 | trusty-updates | source util-linux | 2.27.1-6ubuntu3 | xenial | source util-linux | 2.27.1-6ubuntu3.10 | xenial-updates | source util-linux | 2.31.1-0.4ubuntu3 | bionic | source util-linux | 2.31.1-0.4ubuntu3.6 | bionic-updates | source util-linux | 2.34-0.1ubuntu2 | eoan | source util-linux | 2.34-0.1ubuntu2.4 | eoan-updates | source util-linux | 2.34-0.1ubuntu9 | focal | source util-linux | 2.35.2-5ubuntu3 | groovy | source
The offending commit has been introduced in util-linux v2.33,
so the fix should go into Eoan (v2.34) and later.
$ git describe --contains 5454df9
v2.33-rc1~309^2~9
$ rmadison -a source util-linux 5.1ubuntu20. 9 | trusty-updates | source
util-linux | 2.20.1-1ubuntu3 | precise | source
util-linux | 2.20.1-1ubuntu3.1 | precise-updates | source
util-linux | 2.20.1-5.1ubuntu20 | trusty | source
util-linux | 2.20.1-
util-linux | 2.27.1-6ubuntu3 | xenial | source
util-linux | 2.27.1-6ubuntu3.10 | xenial-updates | source
util-linux | 2.31.1-0.4ubuntu3 | bionic | source
util-linux | 2.31.1-0.4ubuntu3.6 | bionic-updates | source
util-linux | 2.34-0.1ubuntu2 | eoan | source
util-linux | 2.34-0.1ubuntu2.4 | eoan-updates | source
util-linux | 2.34-0.1ubuntu9 | focal | source
util-linux | 2.35.2-5ubuntu3 | groovy | source