Fix crash in ForcedBattle due to altered `returns` state #725

Job	Run time
Linux-musl-apicheck (x86_64-linux-musl)	1m 39s
Mac-os	1m 58s
Android (21.4.7075529)	3m 3s
Linux-musl (x86_64-linux-musl)	1m 31s
Android (16.1.4479499)	3m 17s
Linux-musl (aarch64-linux-musl)	1m 48s
Android (26.1.10909125)	2m 20s
Mac-os-aarch64	54s
Mac-os-aarch64-cctools	2m 12s
Mac-os-cctools	2m 9s
Windows	1m 57s
Mac-os-universal	15s
Mac-os-universal-cctools	11s
Notify-success	3s
	23m 17s

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