diff --git a/scripts/startup/bl_operators/sequencer.py b/scripts/startup/bl_operators/sequencer.py
index fdb0382a722..715c098093a 100644
--- a/scripts/startup/bl_operators/sequencer.py
+++ b/scripts/startup/bl_operators/sequencer.py
@@ -34,11 +34,14 @@ class SequencerCrossfadeSounds(Operator):
 
     @classmethod
     def poll(cls, context):
+        sequencer_scene = context.sequencer_scene
+        if not sequencer_scene:
+            return False
         strip = context.active_strip
         return strip and (strip.type == 'SOUND')
 
     def execute(self, context):
-        scene = context.scene
+        scene = context.sequencer_scene
         strip1 = None
         strip2 = None
         for strip in scene.sequence_editor.strips_all:
@@ -89,11 +92,14 @@ class SequencerSplitMulticam(Operator):
 
     @classmethod
     def poll(cls, context):
+        sequencer_scene = context.sequencer_scene
+        if not sequencer_scene:
+            return False
         strip = context.active_strip
         return strip and (strip.type == 'MULTICAM')
 
     def execute(self, context):
-        scene = context.scene
+        scene = context.sequencer_scene
         camera = self.camera
 
         strip = context.active_strip
@@ -126,7 +132,8 @@ class SequencerDeinterlaceSelectedMovies(Operator):
         return (scene and scene.sequence_editor)
 
     def execute(self, context):
-        for strip in context.scene.sequence_editor.strips_all:
+        scene = context.sequencer_scene
+        for strip in scene.sequence_editor.strips_all:
             if strip.select and strip.type == 'MOVIE':
                 strip.use_deinterlace = True
 
@@ -141,13 +148,16 @@ class SequencerFadesClear(Operator):
 
     @classmethod
     def poll(cls, context):
+        sequencer_scene = context.sequencer_scene
+        if not sequencer_scene:
+            return False
         strip = context.active_strip
         return strip is not None
 
     def execute(self, context):
         from bpy_extras import anim_utils
 
-        scene = context.scene
+        scene = context.sequencer_scene
         animation_data = scene.animation_data
         if animation_data is None:
             return {'CANCELLED'}
@@ -201,6 +211,9 @@ class SequencerFadesAdd(Operator):
 
     @classmethod
     def poll(cls, context):
+        sequencer_scene = context.sequencer_scene
+        if not sequencer_scene:
+            return False
         # Can't use context.selected_strips as it can have an impact on performances
         strip = context.active_strip
         return strip is not None
@@ -209,7 +222,7 @@ class SequencerFadesAdd(Operator):
         from math import floor
 
         # We must create a scene action first if there's none
-        scene = context.scene
+        scene = context.sequencer_scene
         if not scene.animation_data:
             scene.animation_data_create()
         if not scene.animation_data.action:
@@ -254,7 +267,7 @@ class SequencerFadesAdd(Operator):
         return {'FINISHED'}
 
     def calculate_fade_duration(self, context, strip):
-        scene = context.scene
+        scene = context.sequencer_scene
         frame_current = scene.frame_current
         duration = 0.0
         if self.type == 'CURSOR_TO':
@@ -288,7 +301,7 @@ class SequencerFadesAdd(Operator):
         that corresponds to the strip.
         Returns the matching FCurve or creates a new one if the function can't find a match.
         """
-        scene = context.scene
+        scene = context.sequencer_scene
         action = scene.animation_data.action
         searched_data_path = strip.path_from_id(animated_property)
         return action.fcurve_ensure_for_datablock(scene, searched_data_path)
diff --git a/source/blender/blenkernel/intern/lib_id.cc b/source/blender/blenkernel/intern/lib_id.cc
index 2342309ac94..f534af9769c 100644
--- a/source/blender/blenkernel/intern/lib_id.cc
+++ b/source/blender/blenkernel/intern/lib_id.cc
@@ -220,7 +220,7 @@ void BKE_lib_id_clear_library_data(Main *bmain, ID *id, const int flags)
 
   id->lib = nullptr;
   id->tag &= ~(ID_TAG_INDIRECT | ID_TAG_EXTERN);
-  id->flag &= ~ID_FLAG_INDIRECT_WEAK_LINK;
+  id->flag &= ~(ID_FLAG_INDIRECT_WEAK_LINK | ID_FLAG_LINKED_AND_PACKED);
   if (id_in_mainlist) {
     IDNewNameResult result = BKE_id_new_name_validate(*bmain,
                                                       *which_libbase(bmain, GS(id->name)),
diff --git a/source/blender/blenloader/intern/readfile.cc b/source/blender/blenloader/intern/readfile.cc
index bf291ac0e43..39d8e17252f 100644
--- a/source/blender/blenloader/intern/readfile.cc
+++ b/source/blender/blenloader/intern/readfile.cc
@@ -2239,8 +2239,21 @@ static void direct_link_id_common(BlendDataReader *reader,
     id->session_uid = MAIN_ID_SESSION_UID_UNSET;
   }
 
-  if (ID_IS_PACKED(id)) {
-    BLI_assert(current_library->flag & LIBRARY_FLAG_IS_ARCHIVE);
+  if (id->flag & ID_FLAG_LINKED_AND_PACKED) {
+    if (!current_library) {
+      CLOG_ERROR(&LOG,
+                 "Data-block '%s' flagged as packed, but without a valid library, fixing by "
+                 "making fully local...",
+                 id->name);
+      id->flag &= ~ID_FLAG_LINKED_AND_PACKED;
+    }
+    else if ((current_library->flag & LIBRARY_FLAG_IS_ARCHIVE) == 0) {
+      CLOG_ERROR(&LOG,
+                 "Data-block '%s' flagged as packed, but using a regular library, fixing by "
+                 "making fully linked...",
+                 id->name);
+      id->flag &= ~ID_FLAG_LINKED_AND_PACKED;
+    }
   }
   id->lib = current_library;
   if (id->lib) {
@@ -4759,7 +4772,7 @@ static void expand_doit_library(void *fdhandle,
       BLO_reportf_wrap(fd->reports,
                        RPT_ERROR,
                        RPT_("LIB: .blend file %s seems corrupted, no owner 'Library' data found "
-                            "for the linked data-block %s"),
+                            "for the linked data-block '%s'. Try saving the file again."),
                        mainvar->curlib->runtime->filepath_abs,
                        id_name ? id_name : "<InvalidIDName>");
       return;
@@ -4800,7 +4813,7 @@ static void expand_doit_library(void *fdhandle,
       BLO_reportf_wrap(fd->reports,
                        RPT_ERROR,
                        RPT_("LIB: .blend file %s seems corrupted, no owner 'Library' data found "
-                            "for the packed linked data-block %s"),
+                            "for the packed linked data-block %s. Try saving the file again."),
                        mainvar->curlib->runtime->filepath_abs,
                        id_name ? id_name : "<InvalidIDName>");
       return;