In Survival Games, on the map SG4 , there’s a brick building that is just in front of the gates before the airport.
Inside that building there are many gaps in floor, there’s one that if you fall down there is no possible way to get out. The block underneath is a slab so it a block and a half.
Hey there 
Could you please provide a screenshot 
i could be wrong but i believe this is it? https://twitter.com/starwastakenn/status/1373541148271202307?s=20
edit: okay it isnt the same one but this is an issue as well. i looked at the building in front of the airport gates and didnt see anything so, lol
That issue has already been logged, and the patched map is pending roll out
Please submit a new report if you find any other map issues.