Cannot detect iron bars/Keeps Disappearing when building Iron bars

Hello there! I was trying to build a rollercoaster using iron bars to make the support of the tracks. However, I just detected something strange where I place an Iron bar but doesn't appear in a specific block area, even when a place an iron bar, the iron bars on the other side begins to go invisible but able to detect it while it cannot be seen. It's really unpleasant for me to see this but I wish it will be fixed if possible!