Bug: PP Express renews a day earlier than other gateways when you set a trial with the Sub Delay Add On

[hbcondo]

Describe the bug

When checking out with PP Express on a level that a trial is set using the Sub Delay Add On, the next payment date is a day before, meanwhile, it's the next day for Stripe and Authorize.net

To Reproduce

Steps to reproduce the behavior:

1. Activate 'Subscription Delay Add On'
2. Set up a level with a '7-day trial'
3. Checkout with 'PayPal Express' and note the next payment date
4. Checkout with 'Stripe or Authorize' and note the next payment date
5. See the difference

Expected behavior

The next payment date should be the same day for all the gateways

Isolating the problem (mark completed items with an [x]):

• I have deactivated other plugins and confirmed this bug occurs when only Paid Memberships Pro plugin and the Subscription delay Add On is active.
• This bug happens with a default WordPress theme active, or Memberlite.
• I can reproduce this bug consistently using the steps above.

Note

See the original issue posted in the paid-memberships-pro repo:
strangerstudios/paid-memberships-pro#1826

Reposting here in hopes it will get resolved.