Unable to edit, add or remove renderings from the Presentation Details of standard values

I’ve experienced a problem recently where I would make changes to renderings on the standard values of a template, clicked OK and the changes showed up in the Layout Details window, clicked OK again to finish the update, only to find that the renderings didn’t actually change. This is a really odd issue that probably has something to do with the contents of the __Renderings field.

To solve this problem, I had to delete and re-create the standard values of the item. This always fixes it for me. However, I’m really curious as to what caused the issue in the first place. It doesn’t happen for all Standard values items, only a few here and there. Given my __Renderings field contents (screenshot below), I’m not really sure what happened here, but re-creating the item is a simple enough fix.

blog-rendering-corrupt

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