fix: #3619552 dBlazy.find()/context() fallback (from #3538028) makes...

John Lockerequested to merge
issue/blazy-3619552:3619552-dblazy.findcontext-fallback-from into 3.0.x

fix: #3619552 dBlazy.find()/context() fallback (from #3538028) makes blazyMedia behavior delete unrelated iframes elsewhere on the page

Closes #3619552

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