It's not impossible to have formed lead (Pb) this early - but it is challenging.
AIUI, the preferred locus of origin for the heavier elements (say, 3 iron-mass nuclei upwards) has shifted to NS-NS and/ or NS-BH mergers - where nuclei can get absolutely hammered with neutrons (as also happens in supernovæ) but without the newly formed (and relatively unstable) nuclei having to then plough their way through dozens of solar masses of H/He envelope before getting to see the outside universe - and indeed, for the outside universe (us) to see the nuclei.
But to do that you have to have a generation of stars form, evolve to boom-time, form neutron stars (or an NS and a BH, then find each other, and inspiral ; do the big crash-boom-bang, and spray out the lead (whichever nuclei you're interested in) - which then needs to get sufficiently excited so that we can see it's absorption (or emission) lines. Which is a lot to happen in 434 million years (what I'm getting for the age of the universe at red shift 14.44). It takes time for that neutral hydrogen to cool down from all that recombining (well, combining, really) of electrons and protons to for the CMB - which was the Cosmic Incandescent-hot Background when it formed.
Somehow you've got to get from a relatively homogenous universe (parts per million density variations at the CMB) to one where there are things which are LRD (Little Red Dot) galaxies and things which are visibly not LRDs. And that's got to fit into those few hundred million years along with all the star evolving, NS-NS inspiralling gubbins too. Thats' barely as much time as vertebrates have had jaws!