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That's because you use wrong font for them. The Arial that you chose has not those symbols; and actually rather few fonts have. But two of them exist on Windows 10: Segoe UI Symbol, and Segoe UI Emoji. Which font will be chosen for a missing character, depends on software; so if recently MS changed the Emoji font to be more "suitable" for LO substitution algorithm, this has the consequences you see.

Just select proper font explicitly for your symbols, and you are done.