Retail worker, issue with customer stealing on my watch

Not sure where to post this but-

I work in a store similar to 5 below and popshelf, where we have a self checkout at the front along with 1 actual cash register, I am cashier but usually have a ton of stuff to stock. Our store has been skeleton crew for a while and Saturday night we only have 2 people closing the store, so we have way too many tasks for just 2 people to handle plus a ton of customers. My shift lead told me to ignore the register and let customers go to self checkout so I can focus on stocking away from the register. I said I'm uncomfortable with that but okay. They don't want me standing up there "not doing anything".

Later that night there was a crowd of people and I came over to help and customers told me and the shift lead that two women filled up bags of merchandise and didn't do the self checkout, just left. We reported this to the manager who said she'll investigate and go from there. Based on what you guys know, is it likely I will get in trouble for this?