When you walk into the teleporter in the zone, you won’t be able to fire your gadget until you get closer to the zone.
I found this glitch a while ago, but I’ve pinpointed the glitch to happen when the teleporter is 10 or more tiles away from the zone, and the game realizes you’re out of the zone once you come within 9 tiles of it.
Yeah, I’ve run into bugs with it never thinking I left the zone either.
My suggestion for you would to just email hello@gimkit.com and tell them what’s going on.
Oh also
This happened to my bug too. I found it to be around 10 tiles, similar to what you said.
Just know you’re not the only one and this is a universal issue that Gimkit needs to fix.