I changed kdump.conf to use my unencrypted boot partition, and I was able to reproduce the crash.
However, I got was this one file:
/boot/crash/127.0.0.1-2018-12-29-04\:03\:15/vmcore-dmesg-incomplete.txt
Thanks for the report, Joseph. I believe this is a duplicate (and should be fixed in the current Rawhide kernel, can you confirm that?).
*** This bug has been marked as a duplicate of bug 1659706 ***