I have a dual flush corona and there is a stream of water leaking into the bowl. It periodically has to continue to fill when it gets low. I have replaced the round seal inside the tank at the very bottom. However, the leak continues. What do I do next?

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How old? Who installed? Any warranty? I'd follow that route first.
If not warranty I'd try to get the installer to be interested. Perhaps he will have a "red face" an help out.

That would be a leaking flapper valve. They are inexpensive and easy to install. Good luck

I’m happy to help further over the phone at https://www.6ya.com/expert/robert_24775b73ca70da93

watch the mechanism after you flush. If the opening that lets water into the bowl does not close snugly, tiny stream will continuously flow. Make sure it closes properly.

if you flush and the water continues to run into the bowl the it is the flush washer that needs repalcing
If that water shuts off and the cistern fills and then continues so that it flows down the over flow pipe into the bowl the it is the water inlet control washer that needs replacing

The bowl is cracked and is leaking down the drain. You will have to replace it. It may have cracked if the bowl hold-down bolts were overtightened, or the bowl was not able to sit flush (pardon the pun) on the floor. If the bowl rocks when it is first installed, instead of tightening the hold-down bolts, use a couple of tapered shims under the edge of it, then caulk to fill the gap and hide the shims.
Good luck.

First make sure it is not overfilling. The water level must stop before it reaches the overflow pipe. If it continues to run it will overflow into the bowl and continue to run. Adjust the fill level to the mark inside the tank. Make sure nothing is getting under the flapper and holding it open. You replaced the flapper so we know that is not the problem. Just make sure the flapper is centered on the drain hole.

Hi
try to increase the amount of water for each flush .