The problem is an iOS default since 2017 and is mobile-specific due to rich text on mobile keypads. On the iphone and iPad, the ASP search text input field is supoporting rich text with emojis et al. The issue appears to be as a result of a new feature in iOS 11, Smart Punctuation, that automatically turns straight into double quotes. This has been the default since 2017!
That could be it actually. I am also using Mac and an Iphone, but I suspect that it’s either not enabled on my end, or it is different by region. No matter what I do, I always get the “normal” double quotes.
Either way, I will look into this in more detail and update the knowledge base soon with this addition.