This is from "z/OS V1R9.0 DFSMShsm Storage Administration Guide" (SC35- 0421-06) page 65. (Other releases may have changed the manual name/number and/or page.) This discussion is for tape mount management datasets ... the description of such is not that clear; but, it really means direct to ML2 migration(s). These behave differently. Note "Trigger Threshold" description here. This may (or may not) explain what you are seeing and why.
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