1.20.70.25 changed the name of all spawn eggs from Spawn "Mob" (Invocar "Mob") to "Mob Spawn Egg" (Ovo de Invocação de "Mob").

However in this process the name of the wither skeleton on his spawn egg was changed from:

Invocar Esqueleto Wither (Spawn Wither Skeleton)

to:

Ovo de Invocação de Esqueleto Definhado (translating back to english would probably be like this: "Wasted Skeleton Spawn Egg).

The used name should be this one here:

Ovo de Invocação de Esqueleto Wither