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Same thing occurs with Sunflowers. The "shell" of the seed comes up with the first leaves and stays on for a day or so. It will fall off when it is ready.
I've picked a few off but it leaves those first pale green leaves (I know that they are not actually "leaves") unprotected.
I suspect that nature keeps them on so that they have a better chance of poking up through the dirt. A harder covering.
That Swiss Chard "shell" looks really odd but maybe that's the leftovers. Blow your picture up and you can see the other "leaf" starting to poke out on the left side.
So, nothing to be concerned about...
Hi dniezby, Those are what is referred to as a "seed coat". You may find this article informative:
Seed Coat Stuck – Tips For Removing The Seed Coat After Germination