DNSSEC isn't required to query a DS record. The reason your query
succeeded after you enabled DNSSEC is because systemd-resolved caches it
internally as a result of the DNSSEC lookup.

Once the DS query is cached, the bug will not manifest. Another way to
cache it is:

ubuntu@server:~$ dig ripe.net ds @ +short

ubuntu@server:~$ dig ripe.net ds @ +short
10186 13 2 BC15C85E16FE7C651EAAFCEE3B1F1C956217A5B70A536BFEF38C24A9 AB7B9A3F

ubuntu@server:~$ dig ripe.net ds @ +short
10186 13 2 BC15C85E16FE7C651EAAFCEE3B1F1C956217A5B70A536BFEF38C24A9 AB7B9A3F

You received this bug notification because you are a member of Ubuntu
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  systemd-resolve hides DS records in explicit queries

Status in systemd package in Ubuntu:

Bug description:
  When querying for DS resource records on a DNSSEC signed domain using
  dig, the DS records are not shown when the system is using systemd-

  Run: dig +short DS ripe.net

  Expected: something like
  40991 8 2 D8D3C88263D58930A8B5FE16427130AB84CA73A4988385B2F4B121A7 2E5299A6

  Actual result: no output.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu10.15
  ProcVersionSignature: Ubuntu 4.15.0-46.49-generic 4.15.18
  Uname: Linux 4.15.0-46-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Thu Apr  4 14:14:06 2019
  MachineType: MSI MS-7A70
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-46-generic 
root=/dev/mapper/system-slash ro
  SourcePackage: systemd
   [EXTENDED]   /lib/systemd/system/rc-local.service → 
   [EXTENDED]   /lib/systemd/system/user@.service → 
   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/03/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: A.80
  dmi.board.asset.tag: Default string
  dmi.board.name: B250M PRO-VDH (MS-7A70)
  dmi.board.vendor: MSI
  dmi.board.version: 2.0
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 2.0
  dmi.product.family: Default string
  dmi.product.name: MS-7A70
  dmi.product.version: 2.0
  dmi.sys.vendor: MSI

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