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Description of problem:
Found through - https://bugzilla.redhat.com/show_bug.cgi?id=1950974

There is a custom instantiated mount unit used whose name is `etc-NetworkManager-system\x2dconnections\x2dmerged.mount`. This mount unit was working fine with RHEL CoreOS 4.7 which is based on RHEL 8.3. When using RHEL CoreOS 4.8 which is based off of RHEL 8.4, this unit is not enabled by systemd-preset which is done through ignition. On changing the name of the mountpoint to `systemConnectionsMerged` rather than system-connections-merged and the unit's name to `etc-NetworkManager-systemConnectionsMerged.mount`, it works as expected.

Noticed that this was because the preset file contained:

enable etc-NetworkManager-system\x2dconnections\x2dmerged.mount

changing this to:

enable etc-NetworkManager-system\\x2dconnections\\x2dmerged.mount

worked. but the previous format used to work in RHEL8.3

Version-Release number of selected component (if applicable):
RHEL 8.4

How reproducible:
Always

Steps to Reproduce:
1.Create a mount unit with special character "-" encoded as \x2d
2.create preset file with just one slash for the \x2d
3.try to enable with systemctl preset

Actual results:
unit is not enabled

Expected results:
unit should be enabled

Additional info:

fix merged to github master branch -> https://github.com/redhat-plumbers/systemd-rhel8/pull/171

Verified on systemd-239-49.el8.x86_64

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (systemd bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:4469

Since the problem was originally reported by someone working on RHCOS where the problem was seen, we'd like to see the fix backported to 8.4.z where multiple versions of RHCOS could consume the fix.

Most recently, this problem was observed again on a development version of RHCOS 4.10 that is using RHEL 8.4 - https://github.com/openshift/os/issues/665

David,

Do you happen to know the status in terms of the backport request? (https://bugzilla.redhat.com/show_bug.cgi?id=1952686#c9).