The first thing that comes to mind are snails and/or slugs. In the 1st pic it almost looks like there are dried slime markings on the leaf...a sign of slugs/snails. Try this test: place apple slices, about 1/4" thick, on top of the media. Leave them in place overnite and in the early AM check the underside of the slices. Snails are very small, sometimes requiring a magnifying glass but you'll see them. They get into the pot, if you have your chids outside for the summer. They also come in when you purchase a new plant and they were there from the vendors. The other situation, as happened to me several weeks ago, is damage from falling objects like hail or acorns or debris.....
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