Is there TAB in button's description field prevents to show a full line?
with TAB after "level" word:
same button without TAB:
I do not know how it (TAB) was entered into the field (maybe through a text editor).
Tab has special meaning in button labels and tips. You need to avoid the character (except where it's intentional, e.g. to show a hotkey next to a menu item).
(Not something we want to change, as it has worked this way for at least 17 years and changing it would break something else. 
)
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