The events contain tag "t" with "B" as hashtag i.e. So it's the app you published with that added B as hashtag. That note has "client"="Coracle" - @hodlbod maybe Coracle doesn't parse hashtags with accents properly? Notes published with some other client seem fine:

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You are absolutely correct! I recall that I notified @hodlbod about this problem in Coracle some time back. My bad. Sorry to cause you work delving into this. I'll crawl back in my little corner. :)