lshw shows two banks of memory but MAAS is still correctly calculating
the output from lshw. There are twelve occurrences of the line <size
units="bytes">34358689792</size> which is 384GB. I looked up the part
number reported by lshw, 72ASS8G72LZ-2G3B2. According to  each DIM
should be 64G, not 32G. There is a commit upstream  which adds
support for DDR4 RAM and another  which adds support for larger
amounts of RAM found in DDR4 RAM. As  says this module is DDR4 I
suspect the version of lshw in Ubuntu needs both these patches.
@dgrosvenor could you try building lshw in rescue mode to confirm?
sudo apt install git gcc make
git clone https://github.com/lyonel/lshw.git
sudo ./lshw -xml > lshw.log
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Lshw incorrectly detects amount of RAM in system
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