deleteOne in a transaction bug

[anasqadrei]

When I use deleteOne in a transaction, it aborts and gives me this error:

(node:42891) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): MongooseError: Callback must be a function, got [object Object]
(node:42891) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

However, it works fine with deleteMany

This is the gist to reproduce the problem.

I'm using Node.js 8.9.3, Mongoose 5.5.11 and MongoDB 4.0.9 on Atlas