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It's still safe
I've got and use Baader, 1000 Oaks and JMB solar filters.
The mylar based Baader can have some pinholes in the coating, if we're talking about say 6 or so spread across the whole aperture, there's no serious risk.
More cosmetic than dangerous.
Baader do suggest, if you want, to touch-up the pinholes with a TEXTA.
If it's brand new, straight out the box, I would try to get a better replacement.
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