This looks like a new privacy feature of Chrome on Android to not insert copied links into clipboard.
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Open website
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Tap on address bar
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Copy link via tap on icon
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Go somewhere like Discourse composer and try to insert via “long-tap” → context-menu → "insert
This fails.
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Have a look on your keyboard - there is the link and can be inserted:
Alternative:
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Copy link and make it appear in clipboard.
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Results:
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And now you can insert the link anywhere - also via “long-tap” → context-menu → “insert”.