Creepers at the player's exact position with an explosion radius of 0 set the player's velocity to NaN

Can confirm. If the player survives the explosion, they are prevented from moving until they receive knockback or relog. This is only really an issue in creative mode, since the explosion will kill them if they are in survival even if they have full Blast Prot 4 Netherite and Resistance 4 (the armor will also be broken instantly, even if it has Unbreaking 3). Usually there is no effect on TPS, but my survival test with fully enchanted armor and Resistance 4 froze the server for 39 seconds.

Well, you can survive with a totem, but the more straightforward reason why this doesn’t affect survival is that creepers don’t have zero explosion radius.