When a spider sttacks you, they always do it while jumping. It's not the Bedrock Edition case: They jump first and after falling "(on the floor)" finally attack. This issue independently happens wherever you are, it's incessant .

I did discover this because of comparasing the Java Edition Spider's Behavior. This AI issue took/take place many versions ago, and that's why i´m here, because of the uncertainty of what is intentional and unintentional; but i´m pretty sure goes to the Bug Sides and didn't used to be that way.