Fixes runtime error when particle accelerators hit the edge of a plan… #48552

Job	Run time
Compile All Maps	1m 28s
Find Maps to Test	31s
Lints	1m 41s
Lint with OpenDream	43s
Compile and Run Tests (donutstation)	5m 18s
Compile and Run Tests (gaxstation)	4m 50s
Compile and Run Tests (icemeta)	7m 50s
Compile and Run Tests (manateestation)	5m 53s
Compile and Run Tests (yogstation)	5m 50s
Compile and Run Tests (multiz_debug)	4m 18s
Compile and Run Tests (ministation)	4m 59s
Compile and Run Tests (runtimestation)	4m 11s
Final Map Test	1s
	47m 33s

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