'Issue with locked grid column drag drop in Ext js 6.2.1

The first column is locked and other have lockable: false config. When I dragging the column inside the locked column header area the indicators are not removing. Is there any workaround for this or how do I remove the indicators.

Here is the link of fiddle - https://fiddle.sencha.com/#view/editor&fiddle/3j30

Other solution can be if I drag the column to locked column header area it should drop to the first position of the unlocked grid side. How can I able to achieve this as there is no event firing for this action.

I am also attaching a screenshot of the error in fiddle - Indicators not hiding issue



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