Or slugs.. They can be harder to spot than snails, but check the plants in the evening. They also hide in the medium. Even if you can't find them, a repot into fresh medium may be a good idea.
That looks like slug or snail damage. Bush snails are tiny dark brown things, half the diameter or less of a pencil eraser. They hide in the medium during the day. They come out at night to feed, when you might find them with a flashlight. Submerge the plant, pot and medium in a bucket of water and see whether any crawl out to avoid drowning.
They and their eggs can be killed by pouring strong cooled coffee through the medium. Water the plant well before, so the roots are saturated with water. Drain, then pour through the coffee. Repeat the watering in an hour to rinse out the coffee. Some OB members have reported root damage with coffee, but I haven't seen it when I did the presoak and rinse.
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