Honestly, the new method of completing research only ever crashes my game. It just doesn't work - when activated, my game just crashes and I prompted to send a crash report when I start it again.
Are you using a new playthrough? Stellaris is well known, and informs you as such, that previous version saves can be incompatible with the new version changes. If it is an old file, it's possible something in the litany of changes has affected how your old save interacts with the new research. This wouldn't be something the devs would account for, as they aren't fixing the game with trainer users in mind.
If you're using a brand new save, have already tried uninstalling and re-installing, have cleared caches, disabled AV issues, and are still getting the crash, then maybe consider sending your save file in with your report.