UncaughtHandler.uninstall() restores previous whenever the current default handler is any UncaughtHandler, not the caller's own:

if (Thread.getDefaultUncaughtExceptionHandler() instanceof UncaughtHandler ours) {
    Thread.setDefaultUncaughtExceptionHandler(ours.previous);
}

If adapter A installs, then adapter B installs, and then A stops, B's handler is removed while B is still running, so uncaught exceptions stop being reported. This only happens when two adapters' lifetimes overlap. A plain stop-then-start is fine.

Fix direction: uninstall removes only the handler that the caller installed.