This patch was taken from Arch Linux's gitlab repo:
https://gitlab.archlinux.org/archlinux/packaging/packages/python-pykeepass/-/blob/main/0001-fix_missing_pykeepass_kdbx_parsing.patch
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -37,7 +37,7 @@
 Changelog = "https://github.com/libkeepass/pykeepass/blob/master/CHANGELOG.rst"
 
 [tool.setuptools]
-packages = ["pykeepass"]
+packages = ["pykeepass", "pykeepass.kdbx_parsing"]
 include-package-data = true
 
 [build-system]