Problem exporting a plot with an inset plot (weird resizing)

Question

I'm having issues in saving out a plot with another plot inset within it. Here is a basic example.

theInsetPlot = Plot[Sin[x], {x, 0, 6 Pi}];

plotWithInset = Plot[Sin[x], {x, 0, 6 Pi}, PlotRange -> {{0, 6 Pi}, {-10, 30}}, Epilog ->{Inset[theInsetPlot, {7, 15}]}]

This gives me a plot with an inset plot. If I right click the image and use "save graphics as.." to save out a .jpeg I get the following. Which matches the notebook output image.

However, if I rasterise the image

Rasterize[plotWithInset]

or save out with the following code

Export[NotebookDirectory[] <> "testPlotAuto.jpeg", plotWithInset]

I get this image

As you can see, the inset graph is scaled weirdly. This is the same for all of the different output formats I have tried.

My actual example is are complicated, but this minimal example shows the problem.

I'm on: "12.1.1 for Mac OS X x86 (64-bit) (June 19, 2020)"

Answer 1

Confirmed as a bug by Wolfram Tech Support. The following are workarounds until it is fixed.

For Rasterising

Rasterize@Framed[plotWithInset, FrameStyle -> None]

For Exporting

Export[NotebookDirectory[] <> "testPlotAuto1.jpeg", Framed[plotWithInset]]