It is more likely that time is digital (or quantized). For space to be digital, it would have to be “holely” in that marbles in a jar have spaces between them. That would be not allowed. If time were digital, particles could be like marbles in a jar.
Now, hold on a second, if you FLIP the concept, and imagine that space is like “holes” in a jar of marbles that OVERLAP and occupy, in part, the same space as other marbles, that’d give you a lot of jitter eh!
You are overlooking the possibility that those marbles are all identically shaped cubes. No gaps between cubes.