This bug was fixed in the package postgresql-12 - 12.19-0ubuntu0.20.04.1

---------------
postgresql-12 (12.19-0ubuntu0.20.04.1) focal; urgency=medium

  * New upstream version (LP: #2067388).

    + A dump/restore is not required for those running 12.X.

    + Also, if you are upgrading from a version earlier than 12.18, see
      those release notes as well please.

    + Fix INSERT from multiple VALUES rows into a target column that is a
      domain over an array or composite type (Tom Lane)

      Such cases would either fail with surprising complaints about
      mismatched datatypes, or insert unexpected coercions that could lead
      to odd results.

    + Fix incorrect pruning of NULL partition when a table is partitioned
      on a boolean column and the query has a boolean IS NOT clause (David
      Rowley)

      A NULL value satisfies a clause such as boolcol IS NOT FALSE, so
      pruning away a partition containing NULLs yielded incorrect answers.

    + Details about these and many further changes can be found at:
      https://www.postgresql.org/docs/12/release-12-19.html

  * d/postgresql-12.NEWS: Update.

 -- Sergio Durigan Junior <[email protected]>  Tue, 28 May
2024 09:30:50 -0400

** Changed in: postgresql-12 (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/2067388

Title:
  New upstream microreleases 12.19, 14.12, 15.7 and 16.3

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