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groom cache can't be rendered out

i use unreal 4.27, because it can import groom cache , means i can use other 3d application to do more accurate more artistic simulation work , then i can import it in ue 4.27 to render with character together . but …
this is a bug ?i use houdini output groom cache with 24 fps , ue sequencer output the groom not move at all with the same 24 fps , if render other fps ,30 ,25 , all move but flick frames . i test 48 fps output from houdini ,then ue 48 fps not work .other fps can move but wrong result.
anyone can help ,appreciate it .hope some guy can solve this .