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https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-harvesting.htm

This is usually caused by insect damage. Beetles, and flies of many sorts enjoy sucking sap from these fruits.

This collection of articles will give you more information on how to craft your own pest control with ingredients that you likely have in your kitchen already: https://www.gardeningknowhow.com/special/organic

If you did not remove the tough stone hull, then this can take a half year or more. That light is not reaching the true seed, and will not reach the true seed until that stone has dissolved.

To make this faster (With gloves, since all Prunus species contain cyanogenic glycosides in the seeds) you will need to carefully crush the seed with a hammer on the side of the seed where it would normally split. Then put these into soil in your fridge for a month or so until you see action from the seeds.

Now, on another note... If your fridge LED is staying on, even when you close it, I would look into replacing that. Light getting to food during storage is terrible, and will help mold and bacteria grow. You may want to contact the manufacturer.

I'm not sure if this is a continuation, or a duplicate, but I have answered the question on the original.

Light does not matter, especially if these have not been cracked out of the outer stone (carefully, since prussic acid is quite dangerous, so wear gloves.)

In short, no. Light will not play near the role that temperature, conditions, and time will.

If you leave them in the shell, then you may not see action for upwards of 6 months or so.

Please refer to my original answer for a faster way to germinate these.

A semi-ripe peach placed in a closed-up brown paper bag will usually ripen within a day or so. Keep the peaches in this kind of dry, dark environment and check on them periodically. If you want to slow the ripening on some of them, refrigerate them and do the paper bag routine when you're ready. https://www.gardeningknowhow.com/edible/fruits/peach/peach-tree-harvesting.htm

It could be bacterial spot or peach scab. Peeling the fruit should get the spots off. Here is more:

https://www.gardeningknowhow.com/edible/fruits/peach/common-peach-diseases.htm

https://hgic.clemson.edu/factsheet/peach-diseases/