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The notification icon Option "custom text" doesn't work with global variables. The text preview works fine, but as soon as I apply it, the part where the global variable is used just vanishes, as if the global variable doesn't exist. I tested the same formula of the global variable directly in the text, which works fine, and also in other texts, which work too.

I used the formula $gv(global)$. (global just a name of a global variable). Even $gv(global)+""$ or similar just make it vanish and $gv(global, 0)$ results in 0, although the variable exists and works in other parts.