A flatpak regression update has been released for Debian GNU/Linux 10 to address a regression introduced by the previous DSA 4830-1 update.

DSA 4830-2: flatpak regression update

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Debian Security Advisory DSA-4830-2 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
January 22, 2021   https://www.debian.org/security/faq
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Package : flatpak
Debian Bug : 980323

The update for flatpak released as DSA 4830-1 introduced regressions
with flatpak build and in the extra-data mechanism. Updated flatpak
packages are now available to correct this issue.

For the stable distribution (buster), this problem has been fixed in
version 1.2.5-0+deb10u3.

We recommend that you upgrade your flatpak packages.

For the detailed security status of flatpak please refer to its security
tracker page at:
  https://security-tracker.debian.org/tracker/flatpak

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/