diff --git a/beetsplug/mbpseudo.py b/beetsplug/mbpseudo.py
index 9c8b8cdfd3..c96bf87568 100644
--- a/beetsplug/mbpseudo.py
+++ b/beetsplug/mbpseudo.py
@@ -18,6 +18,7 @@
 
 import itertools
 from copy import deepcopy
+from functools import cached_property
 from typing import TYPE_CHECKING, Any
 
 import mediafile
@@ -271,7 +272,7 @@ def _adjust_final_album_match(self, match: AlbumMatch):
             )
             album_info.use_pseudo_as_ref()
             new_pairs, *_ = assign_items(match.items, album_info.tracks)
-            album_info.mapping = dict(new_pairs)
+            match.mapping = dict(new_pairs)
 
         if album_info.data_source == self.data_source:
             album_info.data_source = "MusicBrainz"
@@ -309,6 +310,13 @@ def __init__(
             if k not in kwargs:
                 self[k] = v
 
+    @cached_property
+    def raw_data(self):
+        # Info.raw_data does self.__class__(**self.copy()) which fails for
+        # PseudoAlbumInfo since __init__ requires pseudo_release and
+        # official_release. Construct a plain AlbumInfo instead.
+        return AlbumInfo(**self.copy()).raw_data
+
     def get_official_release(self) -> AlbumInfo:
         return self.__dict__["_official_release"]
 
diff --git a/docs/changelog.rst b/docs/changelog.rst
index 853080f35e..fc73f27893 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -17,9 +17,11 @@ New features
 - :ref:`import-cmd`: The ``--nomove`` / ``-M`` CLI flag can now be used to
   override the ``move: yes`` config option during import.
 
-..
-    Bug fixes
-    ~~~~~~~~~
+Bug fixes
+~~~~~~~~~
+
+- :doc:`plugins/mbpseudo`: Fix crashes when applying a pseudo-release. One in
+  ``PseudoAlbumInfo.raw_data`` and a ``sqlite3.ProgrammingError``.
 
 ..
     For plugin developers
diff --git a/test/plugins/test_mbpseudo.py b/test/plugins/test_mbpseudo.py
index 7f83f0bc42..0dd7f9bfd5 100644
--- a/test/plugins/test_mbpseudo.py
+++ b/test/plugins/test_mbpseudo.py
@@ -93,6 +93,16 @@ def test_determine_best_ref(
         info.use_pseudo_as_ref()
         assert info.data_source == "test"
 
+    def test_raw_data(
+        self, official_release_info: AlbumInfo, pseudo_release_info: AlbumInfo
+    ):
+        # raw_data calls self.__class__(**self.copy()), which failed for
+        # PseudoAlbumInfo because its __init__ requires pseudo_release and
+        # official_release args that are not present in the flat copy() dict.
+        info = PseudoAlbumInfo(pseudo_release_info, official_release_info)
+        data = info.raw_data
+        assert data["album"] == "In Bloom"
+
 
 class TestMBPseudoMixin(PluginMixin):
     plugin = "mbpseudo"
@@ -236,6 +246,39 @@ def test_final_adjustment(
         assert match.info.album_id == "pseudo"
         assert match.info.album == "In Bloom"
 
+    def test_final_adjustment_updates_match_mapping(
+        self,
+        mbpseudo_plugin: MusicBrainzPseudoReleasePlugin,
+        official_release_info: AlbumInfo,
+        pseudo_release_info: AlbumInfo,
+    ):
+        # Regression test: _adjust_final_album_match must update match.mapping,
+        # not album_info.mapping. Writing to album_info (an AttrDict/dict subclass)
+        # stored a {Item: TrackInfo} dict under "mapping", which then leaked into
+        # item_data and caused sqlite3.ProgrammingError on flex field storage.
+        pseudo_album_info = PseudoAlbumInfo(
+            pseudo_release=pseudo_release_info,
+            official_release=official_release_info,
+            data_source=mbpseudo_plugin.data_source,
+        )
+        item = Item()
+        item["title"] = "百花繚乱"
+        original_track = pseudo_album_info.tracks[0]
+
+        match = AlbumMatch(
+            distance=Distance(),
+            info=pseudo_album_info,
+            mapping={item: original_track},
+            extra_items=[],
+            extra_tracks=[],
+        )
+
+        mbpseudo_plugin._adjust_final_album_match(match)
+
+        # match.mapping must be reassigned; album_info must not store a dict value
+        assert "mapping" not in pseudo_album_info
+        assert not any(isinstance(v, dict) for v in pseudo_album_info.values())
+
 
 class TestMBPseudoPluginCustomTagsOnly(TestMBPseudoMixin):
     @pytest.fixture(scope="class")