A Twitter user claims that his OnePlus Nord 2's charger spontaneously exploded when it was connected to the wall. The actual smartphone was unplugged and did not sustain any damage. OnePlus investigated the issue and determined its cause to be voltage fluctuations.
https://www.notebookcheck.net/OnePlus-Nord-2-charger-explodes-for-no-apparent-reason-company-pins-the-blame-on-voltage-fluctuations.567353.0.html