Expiration date bug for Legacy Pay As You Go?

Also have a prepaid legacy plan, minimum $10 for one year.

Went to the store today to add $10 to keep the account active for another year.  After paying, saw the resulting paperwork with an expiration date of 3 months (3/26/22), not the full year I was expecting.  They said it was because of a new system that went into effect this year.

Had the store employee call their customer service.  Because of the wait time (~2 hours), I asked that when the employee gets a reply, to call me.

They called a while later, and left the following message:

I will check back at the store next week, to fully insure that the expiration date is now truly one year, instead of three months.