Free trial period is not shown correctly on Stripe checkout

I am using the Stripe plugin for subscriptions. One of them has a 7 days free trial. But by setting 7 days (and some minutes to be safe), on checkout Stripe still shows 6 days:

This was Stripes support answer.

Screenshot 2023-03-27 at 14.21.29

I am not sure what I’m supposed to do wiith this answer, since I do not have that many options with the plugin. Does this mean, that the plugin is not suitable for free trial settings?