using a silk touch pickaxe doesn't allow you to pick up seagrass
you can pick up normal grass with it, so I'm pretty sure this is a bug.
just use a silk touch enchanted pickaxe to see what I'm talking about, using shears allows you to pick it up so this is diffidently a bug or oversight.
this bug is relevant to (from what I can tell) all versions from 1.14+
Environment
windows
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duplicates 1
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We're tracking this issue in MC-166084, so this ticket is being resolved and linked as a duplicate.
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You're wrong, silk touch items do not make grass drop as a block, only shears do. Same goes for seagrass. Not a bug.