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also as a workaround, the object will 'flip' if you resize it past the side you want to flip it on. Like to flip to the right, resize by dragging resize handle at the left border over the right border. (and if you hold Shift key while resizing, it will keep image proportions)
Yes resizing past the side wouldn't 'flip' imported image, this is by design.
You can add a new feature request to change that, or you can add your vote or comments on feature request for 'flip'