Well, I tried all I could and I think it's not fixable :/.
We don't have specific fonts like chinese or japanese (I guess we use the euro ones).
To see if it was coming from the fonts, I used the default interface and added the find it functionnality to the default store window (with default fonts). Sure enough, it didn't work too. The same bug was present.
If you come up with another idea I can check out, go for it
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Gistum.