Ok, sorry, I don't need any extra steps. I was able to reproduce it, and I think I have a workaround for you:
1. Select your Phoenix map in the material editor.
2. Right click > Show / hide > Additional params > Show all
3. Change "RGB offset" to 0.5
This is not very professional, but... I have no idea what this is and why it works. I admin that I found it totally randomly, but it seems to fix the issue in V7.
V6 renders as expected.
I am attaching screenshots showing the option.
I will also report this to our dev team, and will most likely involve the Phoenix team.
(Report ID=CRMAX-529)