Korean input not working

issue : korean input is not working correctly (and I presume other non-latin languages like Chinese and Japanese to act the same)

how to reproduce : type in postman app using ibus-hangul input

I've tested the same thing on original tar.gz file from postman website, and Korean input is working fine there. Having difficulty with non-latin inputs seems to be a recurring issue on both flatpak and snap apps. The same problem used to happen on other apps I use like vscode and pycharm, but the problems there got resolved after some updates. I have no knowledge about packaging so can't be certain, but I think it has to do with dependencies included with containerized apps. Please check on this issue. Thanks