Hi @dgondelach,
Welcome to the Orekit forum!
I found the same error 3 days ago. An issue has been opened on the Orekit Gitlab repository to fix it.
The error appends in DSST orbit determination (PropagationType.OSCULATING) with a backward propagation mode. In other words, if the epoch of your initial state is closer to the epoch of the last measurement (in chronological order) the error occurs. In forward propagation mode, everything work.
I had not yet found the solution to fix the error.
After a quick investigation, I found that it is not just related to DSST orbit determination. Indeed, the error can be reproduced without using the DSST under orbit determination conditions. Furthermore, this bug is an old one because it can be reproduced using Orekit 9.2.
In the link above, I attached two tests (one using Orekit 10.2 and one using Orekit 9.2) to reproduce the error and try to fix it.
Best regards,
Bryan