Creeper explosion doesn't affect blocks if set to high radius

When you summon a Creeper with an explosion radius of over 127 (or use entitydata command) and ignite it with flint and steel, the explosion does not affect blocks.

/summon Creeper ~ ~ ~

{ExplosionRadius:128,129,130...}

/entitydata @e[type=Creeper]

{ExplosionRadius:128,129,130...}