I experienced a crash, so I looked at the forum to find many such instances involving the DRT. I removed it and sure enough, no crash.
Poking through the log, I found the following line:
2024-03-15 11:04:29 CL650[dr.c:553]: assertion "dr->value != ((void*)0)" failed: CL650/glass/heat_on
So I added that dataref to Resources/plugins/drt_ignore.txt. Sure enough, no more crash on load and DRT works with the CL650. According to DRT FAQ, that could point to some bug in CL650:
FAQ: Using DRT causes X-Plane to crash
DRT reads every dataref published by every aircraft and plugin, on every frame of the simulation. Sometimes, they haven't fully been debugged, and may crash. (If you're a developer, the best way to do this is to run X-Plane in a debugger and look at the backtrace of the crash- if you see RefRecords::update() in the backtrace, this is likely what happened.)
In any case, I find DRT is much more useful than the official Data Ref Editor, so I'm happy to be able to use it now.