Hi, I added a data extension in vendor/omnipay/omnipay/src/Omnipay/SagePay/_config folder to add a few fields to a payment record - and all worked fine for several days.
I then added and removed a few things I was playing with via composer - all shop related, and now the yml extension does nothing - it is ignored.
dev/build?flush=all just carries on as it if the file wasn't there and no extension fields created..
Not desperate as I moved it to mysite/_config and is working fine in there - but wondered what might have stopped it from working in the vendor omnipay folder? I have no manifest exclude files vendor folder.
I was going to step through the manifest regenerate code but no time to play says the boss! - even if that would have been more fun!

thanks
Martin