Ext.draw.container can't load in Ext.JS 6.5.1 and newer versions

Clash Royale CLAN TAG#URR8PPPExt.draw.container can't load in Ext.JS 6.5.1 and newer versions
A simple example,
Ext.define('TestExample.view.Test', {
extend: 'Ext.draw.Container',
alias: 'viewmodel.schedule'
...
});
causes a "[E] [Ext.Loader] Some requested files failed to load"
because the class is Ext.draw.Container (It loads with any other class I've tried)
To confirm the problem, see eg https://docs.sencha.com/extjs/6.5.1/modern/Ext.draw.Container.html
and click the run button- it fails! Try the same in version 6.2.0, and it works!
Anyone know about this bug in the newer versions?
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