subscription bug in erpnext15

in erpnext 15 in subscription doctype suppose i create new subscription with date 14/8/2024 with subscription plan monthly with Subscription Start Date is from 6/1/2022 and Subscription End Date is 1/1/2028 what is Current Invoice Start Date of first sales invoice will be generated and what is the Current Invoice Start Date of the second sales invoice will be generated

Please check this.

Reference:

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hello bro i watched this videos and read the documentation
i mean when i upgrade from v13 to v15 from three months subscriptions that were created stop generate invoices
and this github link of issue Subscriptions not generated in v15 · Issue #39092 · frappe/erpnext · GitHub
what is solution for this problem
and is there way to generate invoices in this 3 months that not generated invoices for subscription