I have opened a ticket.
Hello, I am running into the same problem. With Jasper Studio 6.11 the "Stretch with Overflow" property got changed to "textAdjust". Have a look to source. JasperStarter seems to work with the old property up to now. That's why it is not working. Workaround: I have used Studio 6.6, deleted the "textAdjust" attributes from jrxml and compliled then. This is working. Let's hope Jasperstarter will be updated, the last update is from 2019.