This has been fixed upstream in gnome-shell, and Ubuntu 18.04 has a package update going out shortly (currently in bionic-proposed) with the fix (verified to fix the issue by multiple users including me). See https://bugs.launchpad.net/ubuntu/+source/ibus/+bug/1765304/comments/47 through https://bugs.launchpad.net/ubuntu/+source/ibus/+bug/1765304/comments/51 for more.
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This has been fixed upstream in gnome-shell, and Ubuntu 18.04 has a package update going out shortly (currently in bionic-proposed) with the fix (verified to fix the issue by multiple users including me). See https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1765304/comments/47 through https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1765304/comments/51 for more.