Find block & explode & group

Hi all, I did a short script in python in Rhino 5 before. It works in Rhino 5, but for some reason it doesn’t work in Rhino 7. I am not sure what’s wrong… Hope you can help, thanks
The script is as below:
import rhinoscriptsyntax as rs
import scriptcontext

def explodeBlocks():

rs.Command("_SelBlockInstance")
Blocks = rs.GetObjects("Pick Blocks",4096,False,True,False)

if Blocks is None:return

for b in Blocks:
    
    if scriptcontext.escape_test(False):    #Break if press 'ESC'
        break
    
    rs.SelectObject(b)
    rs.Command("_ExplodeBlock")
    rs.Command("_SelLast")
    item = rs.GetObjects("Pick items",0,False,True,True)
    if len(item) == 1:continue     #if the block has one item only,then don't group
    rs.Command("_Group")
    rs.Command("_SelNone")
    
    if scriptcontext.escape_test(False):    #Break if user press 'ESC'
        break
rs.Command("_SelAll")
rs.ZoomSelected()

explodeBlocks()

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