When I used [/effect @s strength 99999 73]
I got strength level 73 and could not attack any enemies
I could attack enemies when using [/effect @s strength 99999 72]
I tried strength level 80 , 90, 100 , 200 and 255 but also could not attack any enemies
But when I tried strength level 1-10,20,30,40,50,60,70-72 , i could attack enemies