I can demonstrate that

    https://cdimage.ubuntu.com/ubuntu-legacy-
server/releases/focal/release/ubuntu-20.04.1-legacy-server-amd64.iso

is affected. The installer prompts with

> Your installation medium is on /dev/sdb. You will not be able to create,
> delete, or resize partitions on this disk, but you may be able to install
> to existing partitions there.

If I preseed

    d-i partman/filter_mounted boolean false

then the prompt is silenced.

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https://bugs.launchpad.net/bugs/1491963

Title:
  preseeding for partman/installation_medium_mounted fails because
  'seen' is forced to false

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