Recumbent bikes with a long wheelbase --- LWB for short --- are similar to those with a short wheelbase. The only real difference is the location of the pedals in relation to the front tire. Instead of being in front of the tire, the LWB recumbent has the pedals between the front and rear wheels. Other than that, you're still cycling in a slightly reclined position with your legs extended in front of you. While this body position can relieve some of the strain placed on your knees from cycling, it's still possible to experience other issues, including foot numbness.
Pedals
The placement of the pedals in relation to your seat could be causing foot numbness. Pedals that are slightly above or even in line with your seat can place your legs in a position where you're increasing the pressure on the balls of your feet. Increased pressure can affect blood circulation and lead to numbness. Shifting gears can help relieve some of this pressure, as can wearing stiff-soled shoes.
Shoes
Besides pedal location, your foot numbness may be the result of the size of your shoes and not the LWB recumbent bike at all. This is especially true when the numbness or tingling is more prominent in your toes than other areas of your feet. Tight shoes can compress the nerves near the balls of your feet, reducing blood flow and leading to either of these sensations. Changing your shoes can help, but loosening the laces of the shoes you're wearing may also prove beneficial.
Position
Remaining in the same position for longer periods of time can also contribute to the foot numbness, according to MedlinePlus. In this situation, your body position is somehow placing pressure on an artery or even a nerve. With an artery, you're obviously affecting blood flow, but nerve compression is affecting the transmission of impulses between your brain and any area of the body beyond the pressure site. As soon as you relieve this pressure, the numbness should subside.
Nerve Injury
The foot numbness you're experiencing can be an indication of something more serious, like tarsal tunnel syndrome or a herniated disk in the spine. In these situations, pressure is being placed on one or more of the nerves running to the feet. Taking a break from cycling can encourage healing, but you should consult your doctor to determine the exact cause of the numbness. Upon assessment, medical professionals can recommend anything from physical therapy to corticosteroid injections to orthotic devices, depending on the diagnosis.
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