slick carousel inside accordion is broken when setting the variableWidth to false?

[graydirt]

short description of the bug / issue, provide more detail below.

If you click the Collapsible Group Items 1 the slick inside of it is broken when setting the variableWidth: false. I would like to know if this is possible to fix. But if you set it to variableWidth: true it is working fine.

Here is the bootstrap doc https://bootstrapdocs.com/v3.3.5/docs/javascript/

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[ paste your jsfiddle link here ]

Here is the fiddle https://jsfiddle.net/graydirt/nvposxz7