Achivement APG Glitch

[Aldash]

Hello, I don't know if this is a map glitch or a server glitch but on achievement_APG_14 on the NY server a sentry can be placed on the sniper fort bridge event after this even the sentry stays floating on nothing

Evidence/Example

 

[R4]

This is a map glitch that has existed in all iterations of the APG map.