fish integration broken in focal

After upgrading snapd from 2.51.1+20.04ubuntu2 to 2.54.2+20.04 I get the following stacktrace upon each start of the fish shell:

/usr/share/fish/vendor_conf.d/snapd.fish (line 3):
fish_add_path -aP $snap_bin_path
^
from sourcing file /usr/share/fish/vendor_conf.d/snapd.fish
        called on line 294 of file /usr/share/fish/config.fish
from sourcing file /usr/share/fish/config.fish
        called during startup

I guess the fish integration was written for a newer version than the one I have. fish_add_path does not seem to exist here.

The shell seems to work fine nevertheless, but it is still annoying.

$ lsb_release -rd
Description: Ubuntu 20.04.3 LTS
Release: 20.04
$ apt-cache policy snapd
snapd:
  Installed: 2.54.2+20.04
  Candidate: 2.54.2+20.04
  Version table:
 *** 2.54.2+20.04 500
        500 http://de.archive.ubuntu.com/ubuntu focal-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     2.51.1+20.04ubuntu2 500
        500 http://de.archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
     2.48.3+20.04 500
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
     2.44.3+20.04 500
        500 http://de.archive.ubuntu.com/ubuntu focal/main amd64 Packages
$ apt-cache policy fish
fish:
  Installed: 3.1.0-1.2
  Candidate: 3.1.0-1.2
  Version table:
 *** 3.1.0-1.2 500
        500 http://de.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: snapd 2.54.2+20.04
ProcVersionSignature: Ubuntu 5.13.0-25.26~20.04.1-generic 5.13.19
Uname: Linux 5.13.0-25-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.21
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Sat Jan 15 15:27:14 2022
InstallationDate: Installed on 2011-11-29 (3699 days ago)
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
SourcePackage: snapd
UpgradeStatus: No upgrade log present (probably fresh install)