Problem after update to 5.1

Hello,
I use this plugin on all the sites I do and I am very pleased. A few days ago I updated to 5.1 and the following problem occurred. When trying to publish the system does not memorize. After I disconnect the plug, everything is ok. Can some help solve the problem because I use the plugin on many sites that need to upgrade to 5.1 and I do not want to have these problems too.
The console displays these errors:

post-thumbnail.min.js:23

ProxyHandler: ObjectTarget: ModuleAlignmentToolbar: (…)Autocomplete: (…)AutosaveMonitor: (…)BlockAlignmentToolbar: (…)BlockControls: (…)BlockEdit: (…)BlockFormatControls: (…)BlockIcon: (…)BlockInspector: (…)BlockList: (…)BlockMover: (…)BlockNavigationDropdown: (…)BlockSelectionClearer: (…)BlockSettingsMenu: (…)BlockTitle: (…)BlockToolbar: (…)ColorPalette: (…)ContrastChecker: (…)CopyHandler: (…)DefaultBlockAppender: (…)DocumentOutline: (…)DocumentOutlineCheck: (…)EditorGlobalKeyboardShortcuts: (…)EditorHistoryRedo: (…)EditorHistoryUndo: (…)EditorNotices: (…)EditorProvider: (…)ErrorBoundary: (…)FontSizePicker: (…)InnerBlocks: (…)Inserter: (…)InspectorAdvancedControls: (…)InspectorControls: (…)MediaPlaceholder: (…)MediaUpload: (…)MediaUploadCheck: (…)MultiBlocksSwitcher: (…)MultiSelectScrollIntoView: (…)NavigableToolbar: (…)ObserveTyping: (…)PageAttributesCheck: (…)PageAttributesOrder: (…)PageAttributesParent: (…)PageTemplate: (…)PanelColorSettings: (…)PlainText: (…)PostAuthor: (…)PostAuthorCheck: (…)PostComments: (…)PostExcerpt: (…)PostExcerptCheck: (…)PostFeaturedImage: (…)PostFeaturedImageCheck: (…)PostFormat: (…)PostFormatCheck: (…)PostLastRevision: (…)PostLastRevisionCheck: (…)PostLockedModal: (…)PostPendingStatus: (…)PostPendingStatusCheck: (…)PostPingbacks: (…)PostPreviewButton: (…)PostPublishButton: (…)PostPublishButtonLabel: (…)PostPublishPanel: (…)PostSavedState: (…)PostSchedule: (…)PostScheduleCheck: (…)PostScheduleLabel: (…)PostSticky: (…)PostStickyCheck: (…)PostSwitchToDraftButton: (…)PostTaxonomies: (…)PostTaxonomiesCheck: (…)PostTextEditor: (…)PostTitle: (…)PostTrash: (…)PostTrashCheck: (…)PostTypeSupportCheck: (…)PostVisibility: (…)PostVisibilityCheck: (…)PostVisibilityLabel: (…)PreserveScrollInReorder: (…)RichText: (…)RichTextInserterItem: (…)RichTextShortcut: (…)RichTextToolbarButton: (…)ServerSideRender: (…)SkipToSelectedBlock: (…)TableOfContents: (…)URLInput: (…)URLInputButton: (…)URLPopover: (…)UnsavedChangesWarning: (…)Warning: (…)WordCount: (…)WritingFlow: (…)blockAutocompleter: (…)cleanForSlug: (…)fullscreen: {bind_resize: ?, dfwWidth: ?, off: ?, on: ?, refreshButtons: ?,?…}getColorClassName: (…)getColorObjectByAttributeValues: (…)getColorObjectByColorValue: (…)getDefaultSettings: ? ()getFontSize: (…)getFontSizeClass: (…)mediaUpload: (…)userAutocompleter: (…)withColorContext: (…)withColors: (…)withFontSizes: (…)_BlockSettingsMenuFirstItem: (…)_BlockSettingsMenuPluginsExtension: (…)Symbol(Symbol.toStringTag): “Module”__esModule: trueget AlignmentToolbar: ? ()get Autocomplete: ? ()get AutosaveMonitor: ? ()get BlockAlignmentToolbar: ? ()get BlockControls: ? ()get BlockEdit: ? ()get BlockFormatControls: ? ()get BlockIcon: ? ()get BlockInspector: ? ()get BlockList: ? ()get BlockMover: ? ()get BlockNavigationDropdown: ? ()get BlockSelectionClearer: ? ()get BlockSettingsMenu: ? ()get BlockTitle: ? ()get BlockToolbar: ? ()get ColorPalette: ? ()get ContrastChecker: ? ()get CopyHandler: ? ()get DefaultBlockAppender: ? ()get DocumentOutline: ? ()get DocumentOutlineCheck: ? ()get EditorGlobalKeyboardShortcuts: ? ()get EditorHistoryRedo: ? ()get EditorHistoryUndo: ? ()get EditorNotices: ? ()get EditorProvider: ? ()get ErrorBoundary: ? ()get FontSizePicker: ? ()get InnerBlocks: ? ()get Inserter: ? ()get InspectorAdvancedControls: ? ()get InspectorControls: ? ()get MediaPlaceholder: ? ()get MediaUpload: ? ()get MediaUploadCheck: ? ()get MultiBlocksSwitcher: ? ()get MultiSelectScrollIntoView: ? ()get NavigableToolbar: ? ()get ObserveTyping: ? ()get PageAttributesCheck: ? ()get PageAttributesOrder: ? ()get PageAttributesParent: ? ()get PageTemplate: ? ()get PanelColorSettings: ? ()get PlainText: ? ()get PostAuthor: ? ()get PostAuthorCheck: ? ()get PostComments: ? ()get PostExcerpt: ? ()get PostExcerptCheck: ? ()get PostFeaturedImage: ? ()get PostFeaturedImageCheck: ? ()get PostFormat: ? ()get PostFormatCheck: ? ()get PostLastRevision: ? ()get PostLastRevisionCheck: ? ()get PostLockedModal: ? ()get PostPendingStatus: ? ()get PostPendingStatusCheck: ? ()get PostPingbacks: ? ()get PostPreviewButton: ? ()get PostPublishButton: ? ()get PostPublishButtonLabel: ? ()get PostPublishPanel: ? ()get PostSavedState: ? ()get PostSchedule: ? ()get PostScheduleCheck: ? ()get PostScheduleLabel: ? ()get PostSticky: ? ()get PostStickyCheck: ? ()get PostSwitchToDraftButton: ? ()get PostTaxonomies: ? ()get PostTaxonomiesCheck: ? ()get PostTextEditor: ? ()get PostTitle: ? ()get PostTrash: ? ()get PostTrashCheck: ? ()get PostTypeSupportCheck: ? ()get PostVisibility: ? ()get PostVisibilityCheck: ? ()get PostVisibilityLabel: ? ()get PreserveScrollInReorder: ? ()get RichText: ? ()get RichTextInserterItem: ? ()get RichTextShortcut: ? ()get RichTextToolbarButton: ? ()get ServerSideRender: ? ()get SkipToSelectedBlock: ? ()get TableOfContents: ? ()get URLInput: ? ()get URLInputButton: ? ()get URLPopover: ? ()get UnsavedChangesWarning: ? ()get Warning: ? ()get WordCount: ? ()get WritingFlow: ? ()get blockAutocompleter: ? ()get cleanForSlug: ? ()get getColorClassName: ? ()get getColorObjectByAttributeValues: ? ()get getColorObjectByColorValue: ? ()get getFontSize: ? ()get getFontSizeClass: ? ()get mediaUpload: ? ()get userAutocompleter: ? ()get withColorContext: ? ()get withColors: ? ()get withFontSizes: ? ()get _BlockSettingsMenuFirstItem: ? ()get _BlockSettingsMenuPluginsExtension: ? ()__proto__: ObjectIsRevoked: false