Currently. the upgrade work by only checking the first 1-5 glass panels to see which is fake panel, it could be completely useless because other players already jumped on those panels by luck. And considering the very high cost of upgrading it, it's painful to see glass inspection be made redundant by chances
I suggest changing it glass inspection will now be an active ability with "charges" (more charges the more you upgrade). Everytime you used one charge, it will check the glass panel IN FRONT of you to see which is fake and real. That way it would still be useful even if the first few glass panels are already cleared