This is a duplicate of this forum post: https://wordpress.org/support/topic/adding-user_url-to-header-no-longer-works/ (I opened the second because this post was originally flagged as spam).
@missveronicatv thank you – I replaced
$fields[ $field ]['match'] = 'https://';
with
$fields[ $field ]['match'] = ' ';
and it seems to work fine now. Wondering exactly why it the previous solution worked but doesn’t now. Is the above just a workaround, or was the original solution wrong/incomplete?