Looks like this is fixed in 25.10 and newer, and does not affect 24.04
LTS as you said. Hence the only affected version is 25.04.

The workaround is to do:

$ mkdir -p /etc/systemd/user.conf.d
$ cat > /etc/systemd/user.conf.d/default-limit-nofile.conf << EOF
[Manager]
DefaultLimitNOFILE=1048576
EOF
$ systemctl --user daemon-reexec

Given (a) only 25.04 is affected, and (b) an easy workaround exists, I
don't think we will SRU a fix for this to 25.04.

** Also affects: systemd (Ubuntu Plucky)
   Importance: Undecided
       Status: New

** Also affects: systemd (Ubuntu Questing)
   Importance: Undecided
       Status: New

** Changed in: systemd (Ubuntu)
       Status: New => Fix Released

** Changed in: systemd (Ubuntu Plucky)
       Status: New => Triaged

** Changed in: systemd (Ubuntu Questing)
       Status: New => Incomplete

** Changed in: systemd (Ubuntu Questing)
       Status: Incomplete => Fix Released

** Changed in: systemd (Ubuntu Plucky)
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/2130664

Title:
  User process have a max file limit of 1073741816 (2^30), caused by
  missing change from Debian

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