When a process has a Conditional Intermediate Catch Event, it should be triggered by a signal like "RuleFlowStateNode-IntermediateCatchEvent-2". This eventtype is created by ProcessRuntimeImpl.initProcessActivationListener().

https://github.com/kiegroup/jbpm/blob/master/jbpm-flow/src/main/java/org/jbpm/process/instance/ProcessRuntimeImpl.java#L427-L436

The logic depends on "-" hyphen. If a process Id contains a hyphen (e.g. "Intermediate-Catch-Event"), the eventtype would be like "RuleFlowStateNode-Intermediate-Catch" and it will not be triggered.