R15 Beta 7 Prores Export Bug (see screen grab)

Just noticed in beta 7 when you export prores from R3D file (6K) Dragon Sensor , I'm getting a thin, green line on top and bottom edge of frame (see attached screen grab) when you export with premium debayer settings.
Green lines go away if you export Half res good, but no one wants that.
When I reverted back to R14.3, the green lines went away and it looked fine.
iMac late 2014
32 G Ram
4 GHz Intel Core i7
Mac OS High Sierra 10.13.6
Green lines go away if you export Half res good, but no one wants that.
When I reverted back to R14.3, the green lines went away and it looked fine.
iMac late 2014
32 G Ram
4 GHz Intel Core i7
Mac OS High Sierra 10.13.6