Japanese input errors
There is an issue with Japanese input where you do not get "standard alphabet" predictions such as katakana of typed letters. For example, there are times when you type "whi" ウィ should appear in prediction but what you see in prediction bar are several of うぃ. One of which does provide ウィ once selected but no way of knowing which one it is. it is incorrectly displayed. also it does not distinguish narrow katakana and normal katakana letters in prediction bar in some cases. in case of うぃ、one of 3 results in ｳｨ. in all case of single katakana word prediction, prediction bar shows 2 of the same normal katakana but one is narrow katakana once selected.
as for narrow katakana, it is not typically used, so it would be nice to have an option to turn off narrow katakana from showing up. long stings of katakana is typically used for foreign words and it is typically impossible with swiftkey to provide proper prediction. having dedicated katakana conversion key of sort to turn all currently typed letters to turn into katakana would be nice addition, as most traditional type software do for japanese.