Media editor widget - raw_transformations broken?

Hello, I am trying to allow users to "re-edit" their images after edit in javascript. To repro the issue, these are the steps:

1. User edits the image with the media editor

2. When user exports, the export event handler in javascript gets a "transformation" string in the event object (it's in raw format)

3. I apply these transformations to the image so the user can see them

4. If user wants to re-edit the image, I attempt to pass the previous transformation through the raw_transformation field, so the user can pick up the edits where they left off.

5. The image read fails because the widget appears to change the raw_transformation I gave it.

For example, here's the transformation my javascript code got back from the "Export" event in step 2:

"c_fill,g_center,h_4032,w_3024/co_rgb:000000,fl_no_overflow,g_north_west,l_text:Arial_113_line_spacing_1:Heading,x_1817,y_1898/q_auto"

However, when I pass this raw transformation back into the media editor widget, I see that the widget attempts to use this transformation in the query, and so a 400 error is returned:

"c_fill,dpr_2.0/c_limit,h_82,w_136/c_fill,g_center,h_4032,w_3024/co_rgb:000000,fl_no_overflow,g_north_west,l_text:Arial_113_line_spacing_1:Heading,x_1817,y_1898/q_auto"

Somehow the media editor widget is adding more stuff to the transformation I passed in and invalidates it.

Is there something I'm doing wrong? This seems like allowing users to re-edit the same picture with the widget would be a common use case, so maybe there's a better way for me to do this?

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