(half) working port to 1.21.11 splitscreen #568

Job	Run time
Generate build matrix	6s
Build with gradle (1.21.10-fabric:1.21.10, false)	3m 19s
Build with gradle (1.21.8-fabric:1.21.8, false)	3m 18s
Build with gradle (1.21.4-fabric:1.21.4, false)	3m 16s
Build with gradle (1.21.10-neoforge:1.21.10, false)	3m 27s
Build with gradle (1.21.3-fabric:1.21.3, false)	4m 2s
Build with gradle (1.21.11-fabric:1.21.11, false)	3m 45s
Build with gradle (1.21.3-neoforge:1.21.3, false)	3m 29s
Build with gradle (1.21.5-neoforge:1.21.5, false)	3m 21s
Build with gradle (1.21.11-neoforge:1.21.11, false)	3m 30s
Build with gradle (1.21.1-fabric:1.21.1, false)	3m 17s
Build with gradle (1.21.8-neoforge:1.21.8, false)	3m 28s
Build with gradle (1.21.4-neoforge:1.21.4, false)	3m 22s
Build with gradle (1.21.5-fabric:1.21.5, false)	3m 55s
Build with gradle (1.21.1-neoforge:1.21.1, false)	3m 29s
	49m 4s

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