Snapshots: store DataFrameDTO instead of MutableDataFrame in snapshot data (#19247)

public/app/features/dashboard/dashgrid/PanelChrome.tsx

@@ -14,7 +14,7 @@ import templateSrv from 'app/features/templating/template_srv';
 import config from 'app/core/config';
 // Types
 import { DashboardModel, PanelModel } from '../state';
-import { LoadingState, ScopedVars, AbsoluteTimeRange, toUtc } from '@grafana/data';
+import { LoadingState, ScopedVars, AbsoluteTimeRange, toUtc, toDataFrameDTO } from '@grafana/data';
 
 const DEFAULT_PLUGIN_ERROR = 'Error in plugin';
 
@@ -129,7 +129,7 @@ export class PanelChrome extends PureComponent<Props, State> {
       if (data.state === LoadingState.Done) {
         // If we are doing a snapshot save data in panel model
         if (this.props.dashboard.snapshot) {
-          this.props.panel.snapshotData = data.series;
+          this.props.panel.snapshotData = data.series.map(frame => toDataFrameDTO(frame));
         }
         if (isFirstLoad) {
           isFirstLoad = false;