TNT and Creeper Explosions Do Not Drop Blocks if the Default Gamemode is Creative

Verification builds:
1.1.4.51 Retail

Summary:
Explosions do not drop blocks if the default game mode is set to 'creative'

Steps to Reproduce:

1. Create a world with the default game mode set to Creative
2. Place TNT or spawn a creeper, and ignite with flint and steel

Observed Results:
Blocks will not drop from the explosion all the time the world default is set to creative, regardless of the /gamerule or the personal game mode.

Expected Results:
Blocks should drop from the explosion, unless the relevant gamerule is changed manually.

Screenshots/Videos attached: Yes

Notes:

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Original Description:

Expected behavior: When a block is destroyed by tnt, an item will be dropped.
Actual behavior: No items drop when a block is destroyed by tnt.