xdotool selectwindow returns invalid windowid about xdotool HOT 3 OPEN

#  xdotool getactivewindow
41943049
#  xdotool getactivewindow -- getwindowname
urxvt
#  xdotool selectwindow
8389062
# printf "%x" 8389062; echo ""
8001c6
#  xwininfo -tree -root|grep 8001c6 -A 62
     0x8001c6 (has no name): ()  1360x767+0+1  +0+1
        24 children:
        0x2800009 "urxvt": ("urxvt" "URxvt")  1360x737+0+30  +0+31
           2 children:
           0x2800010 (has no name): ()  12x737+1348+0  +1348+31
           0x280000e (has no name): ()  1344x731+2+2  +2+33
        0x8001f2 (has no name): ()  26x1+409+410  +409+411
        0x8001f1 (has no name): ()  1x1+0+0  +0+1
        0x8001f0 (has no name): ()  1x25+435+386  +435+387
        0x8001ef (has no name): ()  26x1+1+410  +1+411
        0x8001ee (has no name): ()  1x1+0+0  +0+1
        0x8001ed (has no name): ()  1x25+0+386  +0+387
        0x8001ec (has no name): ()  382x1+27+410  +27+411
        0x8001eb (has no name): ()  1x1+0+0  +0+1
        0x8001e6 (has no name): ()  1x1+0+0  +0+1
           4 children:
           0x8001ea (has no name): ()  1x1+0+0  +0+1
           0x8001e9 (has no name): ()  1x1+0+0  +0+1
           0x8001e8 (has no name): ()  1x1+0+0  +0+1
           0x8001e7 (has no name): ()  1x1+0+0  +0+1
        0x8001de (has no name): ()  1x361+435+26  +435+27
        0x8001dd (has no name): ()  1x361+0+26  +0+27
        0x8001d7 (has no name): ()  1360x1+0+29  +0+30
        0x8001d6 (has no name): ()  1x25+435+1  +435+2
        0x8001d5 (has no name): ()  26x1+1334+0  +1334+1
        0x8001d4 (has no name): ()  26x1+0+0  +0+1
        0x8001d3 (has no name): ()  1310x1+26+0  +26+1
        0x8001d2 (has no name): ()  1x25+0+1  +0+2
        0x8001d1 (has no name): ()  1360x28+0+1  +0+2
           12 children:
           0x8001e5 (has no name): ()  22x22+1285+3  +1285+5
           0x8001e4 (has no name): ()  24x24+3+2  +3+4
           0x8001e3 (has no name): ()  22x22+0+0  +0+2
           0x8001e2 (has no name): ()  22x22+30+3  +30+5
           0x8001e1 (has no name): ()  22x22+1335+3  +1335+5
           0x8001e0 (has no name): ()  22x22+1310+3  +1310+5
           0x8001df (has no name): ()  1227x24+55+2  +55+4
           0x8001dc (has no name): ()  3x28+431+0  +431+2
           0x8001db (has no name): ()  25x3+409+0  +409+2
           0x8001da (has no name): ()  3x28+0+0  +0+2
           0x8001d9 (has no name): ()  25x3+0+0  +0+2
           0x8001d8 (has no name): ()  384x3+25+0  +25+2
        0x8001cc (has no name): ()  434x1+1+409  +1+410
           2 children:
           0x8001ce (has no name): ()  26x1+408+0  +409+410
           0x8001cd (has no name): ()  26x1+0+0  +1+410
        0x8001cb (has no name): ()  1x378+434+31  +434+32
           1 child:
           0x8001d0 (has no name): ()  1x23+0+355  +434+387
        0x8001ca (has no name): ()  1360x1+0+29  +0+30
        0x8001c9 (has no name): ()  1x378+1+31  +1+32
           1 child:
           0x8001cf (has no name): ()  1x23+0+355  +1+387
        0x8001c7 (has no name): ()  1360x737+0+30  +0+31
           1 child:
           0x8001c8 (has no name): ()  1360x737+0+0  +0+31
     0x802acc (has no name): ()  1360x767+0+1  +0+1
        24 children:
        0x1a0006c "bash scripting - how to grep and print the next N lines after the hit? - Super User - Google Chrome": ("google-chrome (/home/spot/.config/chrome)" "Google-chrome")  1360x767+0+0  +0+1
        0x802af8 (has no name): ()  1x1+0+0  +0+1
        0x802af7 (has no name): ()  1x1+0+0  +0+1
        0x802af6 (has no name): ()  1x1+0+0  +0+1
        0x802af5 (has no name): ()  1x1+0+0  +0+1
# printf "%x" 8399564; echo ""
802acc