source-han-sans
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Issue with U+5E54(幔)
The shape of CID16799 and CID62253 are nearly the same.

No, they are not. Which font and version are you looking at and how? This is the latest version of SourceHanSans-Regular.otf:

CID+16799 uni5E54-TW; CID+62253 uni5E54uE0101-JP. They are almost similar and leaving uni5E54uE0101-JP is ok.
Duh. Sorry, I was looking at the Serif layout file which only has two glyphs and TW uses uni5E54uE0101-JP. I don't see any reason we can't do the same with Sans.
For 2.005: Removed uni5E54-TW 幔 and remapped to uni5E54uE0101-JP in the HK and TW CMap resources