Hi there!
Thanks so much for this feedback! But that problem of the sprites not loading does not come from my plugin. That is happening since the last RM MZ updates. You can find more detail on the link below:
https://forums.rpgmakerweb.com/index.php?threads/bitmap-load-listeners-not-worki...
About the reloadGame function, the thing is, by default, RM MZ will kinda close and reopen both the game window and the dev tools window when you press F5.
If you enable the quick restart plugin parameter, it will change that behavior to one that RM MV used, which is faster for debugging, because it does not close the game window.
If you do not want this feature, just set this parameter to false.
Let me know if I manage to help you with that answer! ^^