Update secrets after migrating from Heroku

I just migrated my project from Heroku and want to update one of my env to receive webhooks in fly using following command.

flyctl secrets set WEBHOOK_URL=[endpoint]

However, the new version fails to build and returns an error of aiogram.utils.exceptions.BadRequest: Invalid webhook url specified.

Thus, I tried to reverse my setting by this command:

flyctl secrets set WEBHOOK_URL=[old Heroku endpoint]

The same error persists.

So I check the digests of WEBHOOK_URL in v1 and the latest version. THEY ARE DIFFERENT (7bb59aadf vs c1f487e7) and supposed to be the same.