The isScanForProcessDefinitions property does not only include *.bpmn20.xml and *.bpmn file suffixes, all supported suffixes are deployed. The documentation needs to be updated to reflect this.

Docs: https://docs.camunda.org/manual/7.5/user-guide/process-applications/the-processes-xml-deployment-descriptor/

Code: https://github.com/camunda/camunda-bpm-platform/blob/master/engine/src/main/java/org/camunda/bpm/container/impl/deployment/scanning/ProcessApplicationScanningUtil.java#L68