Characters problem in service task


We have process flow with human tasks and service tasks.
We use different characters with accents likes äöü a.s.o.
We don’t have problems with them in HumanTasks, all characters are visible.
But we have problem in service tasks delegations where accents are replaced with question marks “?”.

public void execute(DelegateExecution execution) throws Exception {
     // accents are replaced with question marks
      Object obj = execution.getVariable("json");

Camunda Spring Boot 2.3.0

Perhaps you have ideas?

As this is most likely an encoding issue, what’s the type of the variable and how do you set it? Also, are you able to reproduce this in a unit test and could share it on github?