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fix tree optimizer mode persistence #450

Job	Run time
typecheck	31s
package	58s
MPI (2 ranks)	1m 11s
MPI (3 ranks)	1m 16s
test (3.12, core, dev)	58s
test (3.11, core, dev)	6m 12s
test (3.10, core, dev)	45s
test (3.12, vmc, dev,vmc)	18m 2s
docs	2m 56s
test (3.12, extended, dev,test-extended,contraction)	31m 11s
	1h 4m 0s