Two things. First your post is wayyy to general and not very specific. Are you using a Camera
node? Are you implementing the zoom yourself? How are you zooming exactly? Are you scaling up sprites? etc. Second, if you think it's a bug there the github issue tracker. A better idea is to report bugs in there instead of posting them in the forum. As you can see no one is answering these things.
I honestly don't understand people asking about fixes/bugs in the forum, that just doesn't make any sense to me. That's exactly what the issue tracker is for. I think you're wasting your time in here asking about this stuff. Think about it, what if there is a bug indeed? How would the forum help you out? Wouldn't it make more sense to just report this to the devs that can actually fix these things? Rant over :). This goes for everyone reporting bugs to the forum obviously