LayoutRebuilder Error - me, warning or bug?

Some of my scenes use the Layout components of uGUI and occasionally I get the following error shown multiple times (10s) on the console:

Trying to add UnityEngine.UI.LayoutRebuilder for layout rebuild while we are already inside a layout rebuild loop. This is not supported.
UnityEngine.Canvas:SendWillRenderCanvases()

I'm not calling anything to force a rebuild, just changing the active state of the parent object that contains a canvas.

Is this just an issue that's being worked on, or should I try to recreate the issue in a test project and upload a bug.