Wall bug- bug that doesn't allow you to use some charged weapons near the wall, bullet or projection doesn't leave the wall.
Weapons which have this bug:
Spur
Arc Razor
Winmillion
Avenger
Divine Avenger
Faust
Gran Faust
Proto Gun
Punch Gun
Stun Gun
Frost Gun
Pummel Gun
Spitfire
Super Stun Gun
Zapper
Blaster
Pulsar
Super Blaster
Heavy Pulsar
Kilowatt Pulsar
--FIXED NEW Magnus
Master Blaster
Radiant Pulsar
Gigawatt Pulsar
Blackhawk
--FIXED??? New Silversix
--FIXED NEW Mega Magnus
Valiance
Supernova
Polaris
Argent Peacemaker
--FIXED??? New Sentenza
--FIXED NEW Iron Slug
--FIXED NEW Callahan

New guns(without spoilers):
*** Blaster
*** Blaster
*** Blaster
*** Blaster
*** Blaster
*** Blaster
*** Blaster
*** Blaster
*** Blaster
*** Pulsar
*** Pulsar
*** Pulsar
*** Pulsar
*** Pulsar
*** Pulsar
*** Antigua
*** Antigua

As you can see, there will be 17 more guns with wall bug. I don't think that people will be happy to see that bug after gunner update and on new guns.