Hi,
This error does seem interesting and certainly shouldn’t happen.
Can you provide the TRACE level jrebel.log and send it to support@zeroturnaround.com with link to this conversation.
Guide to logs: https://zeroturnaround.com/software/jrebel/learn/sending-log/
Make sure to zip the log as it can be rather large.
We will take a look at the log and try to investigate why this error is happening.