Fix Bloch precession Bz initialization #1366

Job	Run time
Julia 1.10 - windows-latest - x64 - pull_request	23m 53s
Julia 1.10 - ubuntu-latest - x64 - pull_request	18m 56s
Julia 1 - ubuntu-latest - x64 - pull_request	25m 37s
Julia 1.10 - macos-latest - x64 - pull_request	29m 11s
Julia 1 - windows-latest - x64 - pull_request	33m 50s
Julia 1 - macos-latest - x64 - pull_request	34m 14s
Documentation	23m 9s
Skip	0s
	3h 8m 50s

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