Stack versions don't work

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I ran into another issue with 5.6.2.1.

My client is trying to go back to a previous version of a stack and it's not working. It's also a bit quirky how it's working, as you have to select the approve icon, close the window, refresh the page, and then you see a green approve button (seems redundant also).

But the stacks don't revert to the version approved.

Is this a bug?

Deladroid