FYI, FWIW, the plugin is still being offered in the Debian 12.2 repository on my MX Linux distro.
Here's the repo listing as shown in aptitude:

i --\ geany-plugin-markdown
Description: markdown plugin for Geany
This plugin provides a real-time preview of rendered Markdown in Geany.

Geany is a small and lightweight integrated development environment using the Gtk+ toolkit.
Homepage: http://plugins.geany.org
Tags: uitoolkit::gtk
Priority: optional
Section: devel
Maintainer: Geany Packaging Team pkg-geany-team@lists.alioth.debian.org
Architecture: amd64
Compressed Size: 523 k
Uncompressed Size: 605 k
Source Package: geany-plugins
Label: Debian
Origin: Debian:12.2/stable [amd64]
Origin URI: http://deb.debian.org/debian/pool/main/g/geany-plugins/geany-plugin-markdown_1.38%2bdfsg-2_amd64.deb
--\ Depends (9)
--- geany
--- geany-abi-18432
--- geany-plugins-common (= 1.38+dfsg-2)
--- libc6 (>= 2.4)
--- libglib2.0-0 (>= 2.37.3)
--- libgtk-3-0 (>= 3.3.16)
--- libmarkdown2 (>= 2.0.6)
--- libpango-1.0-0 (>= 1.14.0)
--- libwebkit2gtk-4.0-37 (>= 2.5.3)
--\ Enhances (1)
--- geany
--\ Conflicts (1)
--- geany-plugin-markdown
--- Packages which depend on geany-plugin-markdown (2)
--\ Versions of geany-plugin-markdown (1)
i 1.38+dfsg-2

And now, after reading the preceding (March 6, 2022) comment by "eht16", I finally understand why the plugin fails to render previews. Darn it. I was pretty psyched to have Geany double up as a live preview Markdown editor.

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