It wasn't about turning invisible, it was just Providence refusing to use his teleporting ability when the player isn't close enough. I can't 100% confirm it but I'm pretty sure it's now impossible to abuse that glitch/AI limit; he'll use his teleport no matter where you are. That's a pretty big deal for Huntress runs, since she can be pretty squishy and at the least it reduces your DPS by a pretty significant margin (for every range class).
Should see whether there's a 1.0.0 version available somewhere.
Should see whether there's a 1.0.0 version available somewhere.