I'm not an expert in QM.
This article (
https://www.inverse.com/article/35077-wtf-is-zero-point-energy) claims "...but if true...", "If there’s as much energy in those fluctuations as some — though definitely not all — physicists believe", and "we can only guess how much energy is actually contained in the vacuum, with legendary physicists in fierce disagreement on this point." Still hypothesizing whether it's true or not.
Wikipedia says (
https://en.wikipedia.org/wiki/Zero-point_energy) "Physics currently lacks a full theoretical model for understanding zero-point energy; in particular, the discrepancy between theorized and observed vacuum energy is a source of major contention."
Britannica says (
https://www.britannica.com/science/zero-point-energy), "Zero-point energy, vibrational energy that molecules retain even at the absolute zero of temperature. Temperature in physics has been found to be a measure of the intensity of random molecular motion, and it might be expected that, as temperature is reduced to absolute zero, all motion ceases and molecules come to rest. In fact, however, the motion corresponding to zero-point energy never vanishes. ... Zero-point energy results from principles of quantum mechanics, the physics of subatomic phenomena. Should the molecules ever come completely to rest, their component atoms would be precisely located and would simultaneously have precisely specified velocities, namely, of value zero. But it is an axiom of quantum mechanics that no object can ever have precise values of position and velocity simultaneously (see uncertainty principle); thus molecules can never come completely to rest."
I took all that to mean that it's still a work in progress, that zero-point energy is still only partially understood, still not confirmed, and is still only theoretical.
In any case, it seems to me (a non-expert) that even in zero-point energy mass and matter still exist (atoms and molecules). I'm open to learning.
So it's just possible that zero-point energy does
not describe a situation where nothing is the source of something. I'll grant I don't know much about it.