This looks like a pretty critical bug. On Spring Boot (investigation on Quarkus needed), the file PredictionConfig is being generated despite the project having a PMML file on it. 

By introducing the new starters (KOGITO-5444), we updated the examples to have a specific engine. So a DMN example, would have only kogito-decisions-spring-boot-starter. See: https://github.com/kiegroup/kogito-examples/tree/1.9.0.Final/decisiontable-springboot-example

In this example, even though there is no PMML whatsoever, the kogito-pmml dependency still needs to be added to compile the generated PredictionsConfig.

This file should not be added in this context. If it requires it somehow, the kogito-pmml then should be part of the Decisions/Rules Starter. The same thing happens for the Rules Starter. See https://github.com/kiegroup/kogito-examples/tree/1.9.0.Final/ruleunit-springboot-example