AvroWriter single record with external schema results in data loss

When a split record tries to create single record splits with an external schema, it does not use a record set and fails to write data.

I have attached a sample flow, if you run a simple flow file through with

first,last
fname,lname
another,name

you will see the resulting flow files have 0 bytes.

Nifi 1.9.2

java -version
openjdk version "1.8.0_201"
OpenJDK Runtime Environment (build 1.8.0_201-b09)
OpenJDK 64-Bit Server VM (build 25.201-b09, mixed mode)