The link card should be updated when adding links of any color: redlinks, regular blue links, or turning missing grey links into red.
This is especially problematic when marking a link as red link: the card remains visible but it is not updated, providing still the option to mark as redlink despite being already a red link. You need to select the link again for the options to be updated.
For regular links, it seems that after a link is added the caret position is reset, and the link card disappears. It would be better if it got updated and remained visible.