Unmerging printed grid causes game to freeze when keep projection is turned off

My game kept Freezing when testing my new missiles. The world it self does not stop, but a bugged popup appears (seen in the image) that prevents me from doing anything. Pressing Ok or ESC does not do anything. Also the window can't be closed from task bar, so to stop the game, task manager must be used. I verified the game files but it did not help

I tried narrowing down the possible problems so i created a empty vanilla save and did some testing. It seems that the problem is somehow related To merge block unmerging a grid that has been printed with projector, which has "Keep Projection" turned off.

In the Included world file, I have setup that should demonstrate the problem. There are two Otherwise similar missile silos, but other one has "keep Projection" OFF and another has it ON. you can test both of them and the one with projection off, should cause the bug when missile is launched. Merge block that Lauches the missile can be toggled with the red button in the button panel

NOTE: I forgot to turn on the welders from the silo with the "keep projection" OFF, but you can turn them on by pressing button panels middle button or from terminal.