get creeper to explode and you will find they don't drop enough to repair the holes in the ground they make.
MC-156265
Creepers dont drop 100% of all blocks they explode
Resolved
Invalid
0
(Unassigned)
Unconfirmed
(Unassigned)
Minecraft 1.14.3, Minecraft 1.14.4 Pre-Release 2
Retrieved
This behaviour is consistent with how the game has always worked. The only change that 1.14 introduced was that TNT will now drop all blocks. This does not apply to other explosions.