doc: Update ChangeLog.md to list Meson bugs

Because several bugs were found in the Meson build infrastructure since
the release of v0.3.3, I've had to keep the existing Autotools
infrastructure running for a bit longer while I address the bugs. As of
this commit, Autotools is still the preferred way to build libx52,
though it is technically deprecated and will be replaced with Meson as
the source of truth.

CI: [skip ci] [skip doxy]

ChangeLog.md

@@ -6,8 +6,19 @@ The format is based upon [Keep a Changelog].
 
 ## [Unreleased]
 
+### Fixed
+- Addressed meson build bugs found in v0.3.3
+
 ## [0.3.3] - 2026-03-12
 
+**Note:** While this release does introduce Meson support and deprecate the
+Autotools framework, there are several bugs in the Meson build files, causing a
+number of missing builds, notably the systemd service file, the documentation
+and man pages. In addition, the translation files were not handled at all, and
+translation services were disabled by default, compared to the Autotools
+framework where it was enabled by default. These bugs will be addressed in the
+next release.
+
 ### Added
 - Updated build infrastructure to use Meson instead of Autotools.
 - Added a [privacy policy](PRIVACY.md) to comply with GDPR/CCPA regulations.