The unicode character "⇙" called South West Double Arrow (U+21D9), when copied into Minecraft appears as "⇘" called South East Double Arrow (U+21D8). This also happens the other way around. It occurs when the text is pasted into signs and the chat and probably other places.
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is duplicated by 1
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This is all because of the order mistake in the unicode_page_21.png. The only way to get rid of this is just replace them at the resource pack.
Can confirm that this is an issue. Also affects 20w51a.