Scroll breaks on Vercel deployment

[sonicviz]

Hi,

I've got an app landing page in latest Quasar with menu buttons triggering scroll to id, as per the docs.
Code is below. It's a webpack project.

function scrollToElement (id) {
  let el = document.getElementById(id);
  const target = getScrollTarget(el)
  const offset = el.offsetTop + 3;
  const duration = 1000
  setVerticalScrollPosition(target, offset, duration)
}

Issue is it works perfectly fine locally with Quasar Dev, but on deployment to Vercel everything else works but the scroll is giving me an error:

vendor.d0888b0b.js:6
TypeError: a is not a function
at v (714.351fbe5f.js:1:2016)
at default.default.default.default.onClick.t..t. (714.351fbe5f.js:1:3428)
at i (vendor.d0888b0b.js:6:11188)
at a (vendor.d0888b0b.js:6:11263)
at Gt (vendor.d0888b0b.js:8:28299)
at k (vendor.d0888b0b.js:69:475263)
at i (vendor.d0888b0b.js:6:11188)
at a (vendor.d0888b0b.js:6:11263)
at HTMLDivElement.r (vendor.d0888b0b.js:14:6970)

I've used this previously and it works on an existing Vercel project, but it's got me stumped why it works locally but is breaking on Vercel build now.

The webpack code looks obfuscated (going by the single character names in the error) but I didn't configure this, which is one thing that seems different and could be the cause of the error.
That's the only difference I can see between local and Vercel deployment.

Has Vercel webpack changed or something in it's default webpack?
Did I miss something else?
I'm following everything here: https://quasar.dev/quasar-utils/scrolling-utils#introduction

Thanks!

Update:
It's very strange it works fine locally, but on deployment to Vercel breaks.
Debugging more it's no longer finding the getScrollTarget(el) function due to something webpack is doing it seems?

Moving from page:  landing
714.ecd24d49.js:1  selected_tab contact - id id_contact
714.ecd24d49.js:1 let el = document.getElementById(id);
714.ecd24d49.js:1 const target = getScrollTarget(el);
vendor.aab19026.js:6  TypeError: o is not a function
    at y (714.ecd24d49.js:1:1963)
    at default.default.default.default.onClick.t.<computed>.t.<computed> (714.ecd24d49.js:1:3704)
    at i (vendor.aab19026.js:6:11188)
    at a (vendor.aab19026.js:6:11263)
    at Gt (vendor.aab19026.js:8:28299)
    at k (vendor.aab19026.js:69:475153)
    at i (vendor.aab19026.js:6:11188)
    at a (vendor.aab19026.js:6:11263)
    at HTMLDivElement.r (vendor.aab19026.js:14:6970)

Locally it is working fine, and shows the successful debug trace:

Moving from page:  landing
LandingLayout.vue:160  selected_tab contact - id id_contact
LandingLayout.vue:162 let el = document.getElementById(id);
LandingLayout.vue:164 const target = getScrollTarget(el);
LandingLayout.vue:166 const offset = el.offsetTop + 3;
LandingLayout.vue:168 const duration = 300;
LandingLayout.vue:170 setVerticalScrollPosition(target, offset, duration);

[sonicviz]

Updated packages, issue resolved.
Still no idea why it works locally and not remotely though, before package updates.