Not Able to Place Blocks In a Specific Area

[SkullSirenz]

USERNAME: SkullSirenz
APARTMENT COORDINATES (F3 TO VIEW):

(Coordinates are in the top left)
ISSUE: I'm unable to place blocks on the empty spaces of the floor and just above it.
ADDITIONAL INFORMATION:

 

[Minobu]

REVIEWED

- The following issue has been resolved​