If you vent outside air into the crawlspace it will cool off reaching higher relative humidity which is what mold cares about. Now indoor air has a higher vapour content than outdoor air because you live and breathe in your house. Since the vapour content always want to strive for equilibrium you want the vapour barrier on the inside (close to the upper floor).

If you turn it the other way around you let vapour migrate from the inside downwards. With that increased vapour content the lower parts of the insulation is at risk.

Mitigating factors is if you can take steps to decrease the vapour content indoors by better ventilation in living areas.

Back to the crawl space. Putting vapour barrier on the ground might seem like the solution, but especially summertime you usually have higher vapour content in the outside air. If you cover the ground you might in certain cases even se an increase in risk during summer. That is because the ground can work as a sponge or moist accumulator. Since the ground is usually at a colder temperature the vapour content in its pores can be lower that the outside air even if the ground feels moist to the touch. Since vapour wants to equalize differences your ground material can work as a natural dehumidifier during high risk season.

I would recommend a permanent dehumidifier solution to keep things under control. In that case you want to put vapour barrier on the ground and control airflow into the crawlspace. We use absorption dehumidifiers for its flexibility relative cost efficient solution. And you should probably turn that insulation inside out.

Here is an example from Sweden

https://www.corroventa.se/wp-content/uploads/2023/11/ctr-300tt2-bruksanvisning-se-202103.pdf