Pumpkin seeds drop from sheared pumpkins is hardcoded

Confirmed, there is no loot table of this nature located in either the gameplay folder or the blocks folder.

Can confirm.

Code analysis:

protected ItemInteractionResult useItemOn(ItemStack itemStack, BlockState blockState, Level level, BlockPos blockPos, Player player, InteractionHand interactionHand, BlockHitResult blockHitResult) {
. . .
         level.setBlock(blockPos, Blocks.CARVED_PUMPKIN.defaultBlockState().setValue(CarvedPumpkinBlock.FACING, direction1), 11);
-> ISSUE START
         ItemEntity itementity = new ItemEntity(
                 level, 
                 (double)blockPos.getX() + 0.5D + (double)direction1.getStepX() * 0.65D, 
                 (double)blockPos.getY() + 0.1D, 
                 (double)blockPos.getZ() + 0.5D + (double)direction1.getStepZ() * 0.65D, 
                 new ItemStack(Items.PUMPKIN_SEEDS, 4)
         );
-> ISSUE END
         itementity.setDeltaMovement(0.05D * (double)direction1.getStepX() + level.random.nextDouble() * 0.02D, 0.05D, 0.05D * (double)direction1.getStepZ() + level.random.nextDouble() * 0.02D);
. . .
      }
   }