So, starting with the same web page displayed in Firefox 68.0.2, and Brave 0.67.125, there is an active link on that web page and I copy its link address to the clipboard.
Here are the datatypes that are placed on the clipboard from either browser:
- public.utf8-plain-text
- NSStringPboardType
Although either of these are the full link text, Pages has no native comprehension of HTML, and cannot transform pasted text into an active link — unless one already has selected text in the Pages document, launched the Link Editor, and pastes the clipboard data directly into the Link Editor's Link field.
In Pages v8.1 on macOS 10.14.6 (18G87), no matter whether I Paste, or Paste and Match Style, only plain black text arrives in Pages. in the document body of a word processing document, or a Text box. The only way that I can paste white text into the Pages document is to have the text color set to white — prior to the paste operation.
I see no abnormality between the current Pages v8.1 and v8.0, v7.3, and v7.1 that preceded it.