\bword\b does not work in handles

[akerbeltz]

I have a custom feed for Scots Gaelic and \brobh\b is one of our shibboleth words to detect Gaelic posts, with the \b \b to avoid overlaps of this word with other languages. Today I suddenly got a lot of Dutch posts and I couldn't work out why, until I realised that the poster was using the handle robhoeij.bsky.social so my guess is that the word break \b doesn't work in the handle field?