Resized GIFs exporting at incorrect frame rate

Had this problem since the last build and it’s continuing into 1.3 beta 7. When I export a GIF at the size I made it (typically 64x), it’ll have the expected framerate I set. If I resize during or before the export (typically 400%), the export will have the wrong framerate (generally with one frame faster/slower than the rest). Happens with as few as two frames.
Happens both on Windows 10 desktop and surface; can give more information as necessary but this is just baffling me. I have to assume this is a bug because the preview is still what I expect, just not the export.