Players have found that red containers may have multiple doors when trying to open them as well as multiple sides when breaking them down.
It is possible to enter and search containers by continuing to open doors.
It is unconfirmed if using this parts on your island can cause a lag build up. If you have recently used container parts and found the lag increased (without the island being full of other items) and decreased when the parts were removed, please let me know and I will update my report for the team.
Please see the post from IggySoda that narrowed down what causes extra containers to spawn - [PS4][Object Spawning]Additional Information on Infinite Shipping Container Panel Bug
And Lothaer, who discovered it occurs with planters too - [PS4][HARVESTING] Infinite Harvest