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DAC2 HD config resets to DAC on reboot on HifiberryOS

I am using Hifiberry OS, and configured /boot/config.txt as below 

dtoverlay=hifiberry-dacplushd

However, when I reboot in /boot/config.txt the value changes to 

dtoverlay=hifiberry-dac

There is also a /boot/config.txt2 created.

How can this be prevented?

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