Issue is visible here https://developer.blender.org/F8626313. If there is enough space for both the item name and the library hint, display both. Otherwise, clip either the item name, the library hint, or both so that not more than 60% and 40% of the available width are used repectively. There are further improvements we could do, as noted in T84188, this just fixes the regression for the release. Part of T84188. There were multiple reports about this, see merged in and mentioned reports in T84188 and T78012.