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Problem when inserting a hyphen before the letter "t"

Hey everyone,

please take a look at this bug, which is happening when I´m typing in a hyphen.
The letter “t” gets deleted, when typing in a hyphen and is replaced with the hyphen.
It´s happening in the Designer, Editor and also und the published site.
Screencast: Loom | Free Screen & Video Recording Software

Thanks for help!