Hey,Bro,Im found the way!This bug is caused by a bug in the Blend Profile setting in the transition rules in the state machine, for example, my animated blueprint will always trigger this bug in the Pivot state, so check all the transition rules about this state machine, in the Detail panel, find BlendSetting, you will find some Blend Profile option followed by the Restore Settings icon (even though this option is really empty), click it to restore, and BOOM!!! Problem solved!!!
PS: Pay attention to check all the Blend Profile settings with suspect transition rules
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