diff --git a/cura/Settings/CuraContainerRegistry.py b/cura/Settings/CuraContainerRegistry.py
index bbd45cdb96..b0ab99ee35 100644
--- a/cura/Settings/CuraContainerRegistry.py
+++ b/cura/Settings/CuraContainerRegistry.py
@@ -708,6 +708,7 @@ class CuraContainerRegistry(ContainerRegistry):
                 try:
                     instance_container.deserialize(serialized, file_path)
                 except ContainerFormatError:
+                    Logger.logException("e", "Unable to deserialize InstanceContainer %s", file_path)
                     continue
                 self.addContainer(instance_container)
                 break
diff --git a/plugins/3MFReader/ThreeMFWorkspaceReader.py b/plugins/3MFReader/ThreeMFWorkspaceReader.py
index 7e86cec6a9..d037d8324c 100755
--- a/plugins/3MFReader/ThreeMFWorkspaceReader.py
+++ b/plugins/3MFReader/ThreeMFWorkspaceReader.py
@@ -12,7 +12,6 @@ import xml.etree.ElementTree as ET
 from UM.Workspace.WorkspaceReader import WorkspaceReader
 from UM.Application import Application
 
-from UM.ConfigurationErrorMessage import ConfigurationErrorMessage
 from UM.Logger import Logger
 from UM.i18n import i18nCatalog
 from UM.Signal import postponeSignals, CompressTechnique
@@ -337,7 +336,9 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                     try:
                         instance_container.deserialize(serialized, file_name = instance_container_file_name)
                     except ContainerFormatError:
-                        continue
+                        Logger.logException("e", "Failed to deserialize InstanceContainer %s from project file %s",
+                                            instance_container_file_name, file_name)
+                        return ThreeMFWorkspaceReader.PreReadResult.failed
                     if quality_changes[0] != instance_container:
                         quality_changes_conflict = True
             elif container_type == "quality":
@@ -648,7 +649,11 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                     definition_container.deserialize(archive.open(definition_container_file).read().decode("utf-8"),
                                                      file_name = definition_container_file)
                 except ContainerFormatError:
-                    continue #Skip this definition container file. Pretend there is none.
+                    # We cannot just skip the definition file because everything else later will just break if the
+                    # machine definition cannot be found.
+                    Logger.logException("e", "Failed to deserialize definition file %s in project file %s",
+                                        definition_container_file, file_name)
+                    raise
                 self._container_registry.addContainer(definition_container)
             Job.yieldThread()
 
@@ -691,7 +696,9 @@ class ThreeMFWorkspaceReader(WorkspaceReader):
                         material_container.deserialize(archive.open(material_container_file).read().decode("utf-8"),
                                                        file_name = container_id + "." + self._material_container_suffix)
                     except ContainerFormatError:
-                        continue #Pretend that this material didn't exist.
+                        Logger.logException("e", "Failed to deserialize material file %s in project file %s",
+                                            material_container_file, file_name)
+                        raise
                     if need_new_name:
                         new_name = ContainerRegistry.getInstance().uniqueName(material_container.getName())
                         material_container.setName(new_name)