Day 3

Genesis 1:9-13 9 And God said, Let the waters under the heaven be gathered together unto one place, and let the dry land appear: and it was so.
10 And God called the dry land Earth; and the gathering together of the waters called he Seas: and God saw that it was good.
11 And God said, Let the earth bring forth grass, the herb yielding seed, and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: and it was so.
12 And the earth brought forth grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself, after his kind: and God saw that it was good.
13 And the evening and the morning were the third day.

When you read Genesis 2:4-6, it seemed to indicate that it was so new that the ecosystem had not yet had time to do its work, it just says "the earth brought forth...", meaning these seeds or plants were already in the earth. When had God created them? In the beginning, or before day 1 at some point.

Genesis 2:4-6 4 These are the generations of the heavens and of the earth when they were created, in the day that the Lord God made the earth and the heavens,
5 And every plant of the field before it was in the earth, and every herb of the field before it grew: for the Lord God had not caused it to rain upon the earth, and there was not a man to till the ground.
6 But there went up a mist from the earth, and watered the whole face of the ground.

It is as if there cannot be periods here instead of a 24-hour day, since otherwise the ecosystem would have been described as having to be created and spread, but this does not happen,

It also says "the earth let sprout", i.e. not a special creation like with the animals, they were already in the earth from the previous creation of the world with everything that was supposed to be there. It had therefore survived from everything that had happened to the earth.

One can imagine: how could those grains have survived? When you look at the creation account, all the water was in the stratosphere, both below and above, i.e. the water was not on the earth because of God's wrath, so plant seeds would have had good conditions to survive for this re-establishment and creation of the world anew if these days had been short. So they would have survived.