Beta 5 Bug - Viewer in Colour page

The viewer in the colour page does not update newly selected clips after noise reduction has been applied.
I have user caching on, but that should not effect anything?
Is this a bug, or am I doing something wrong?

Tell us about your system. Noise reduction is quite demanding on the GPU.

MacBook Pro (Retina, 15-inch, Mid 2015), 2.5 GHz Intel Core i7, 16 GB 1600 MHz DDR3, AMD Radeon R9 M370X 2048 MB, Intel Iris Pro 1536 MB.
Also running a PC with macOS 10.13.5 installed. 3.5ghz i7 Quad Core, 32gb ram, GTX980.
Get the same problem on both machines.
Does not happen if render cache is turned off.
I'm going to do some more tests and I will let you know the results