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Fix BornToBeRoot#444, Fix BornToBeRoot#446 (BornToBeRoot#448)

Co-authored-by: BornToBeRoot <[email protected]>

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Update version to 2020.12.2

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Merge branch 'net5-develop' of https://github.com/BornToBeRoot/NETwor…

…kManager into net5-develop

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Update to version 2020.5.0