So i was doing some work and accidentally burned a small hole about the size of a quarter in the ZZ planter.

It's a plastic planter, recently bought from home depot.

Soil doesn't come out now but I'm sure when i water it, water will come out the hole just as it does the smaller already pre existing holes in the bottom.

Will this affect the plant much? Should i patch/repair the hole?

It won't hurt a thing. I put much bigger holes in the sides of planters on purpose.

Forgot to say earlier, you can grow a plant through the hole, if its' stem isn't too fat and not likely to increase in diameter much as the plant grows.

If soil comes out of any holes, i would re-do. I use old window screen to cover drain holes, to stop soil from coming out. If just water coming out. No worries. Soil, needs to drain.
😎😎😎

Its a ZZ plant. A few extra holes will be beneficial as they hate to be cared for. The ZZ will feel right at home with this added abuse.

i am grateful for the responses and even more so that it's actually great news!

I put holes in the sides of pots on purpose to have more spots to stick cuttings/small stature plants, in attempt to cover fugly plastic pots completely with foliage, and just to be unusual. Some are small holes poked with a screwdriver, some are much larger, cut with pruning shears.