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I looked into this a few years ago and what I found suggested that the tied or stapled bags should be fine. It’s the crimped edges bags you want to watch out for; plastic particles in the paper are how the edges are fused.
I’ve also run into tea bags entirely composed of plastic mesh rather than paper. I don’t understand why someone would think that’s a good idea.
Yeah, they called those “silk” for a while but I’m pretty sure they’ve always been plastic.