Author Schema not working properly in Beamer Template

I use the quarto author schema in beamer template. I am not able to get numbers to indicate author affiliation along with author names . I have modified the latex template using partials. This use to work well in scartcl format.

---
title: "title"
short-title: "shorttitle"
short-institute: "xy institute"
short-author: "john doe"
subtitle: "subtitle"
author: 
  - name: Author1.
    affiliations:
      - id: ref1
        number: 1
        name: Inst1
        department: dep1
    corresponding: true
    email: random@gmail.com
  - name: Author2
    affiliations:
      - ref: ref1
  - name: author 3
    affiliations:
      - id: ref2
        number: 2
        name: inst2
        department: dep2
format: 
  beamer: 
    theme: metropolis
    mainfont: Source Sans Pro
    template-partials: 
     - title.tex
    keep-tex: true 
date: today
date-format: medium
---

my modified title.tex is as follow

$if(title)$
\title$if(short-title)$[$short-title$]$endif${$title$$if(thanks)$\thanks{$thanks$}$endif$}
$endif$
$if(subtitle)$
\subtitle$if(shortsubtitle)$[$shortsubtitle$]$endif${$subtitle$}
$endif$


% Authors
$if(author)$
\author$if(shortauthor)$[$shortauthor$]$endif${$for(author)$$author$$sep$ \\
\and $endfor$}
$endif$

% Affiliations
$if(by-affiliation)$
\institute[$short-institute$]{
$for(by-affiliation)$
    \textsuperscript{$it.number$} $if(it.department)$$it.department$, $endif$$it.name$ \\ 
$endfor$
}
$endif$

Start with the supplied title.tex partial and inspect how the beamer template receives author and by-affiliation data; compare that path with the working scartcl case. Done means author names display their affiliation numbers in the beamer output while the listed affiliations remain visible.