Obscure language switch bug to Japanese/Chinese

As I’m not sure where I would even report this, I hope someone can help me on this.

First, I’m running Fedora 30 and Gnome 3.32.2 with Greek (QWERTY) keyboard.

I have 3 input sources on my machine:
English (US), Greek(Greece), Japanese (Kana Kanji)

Whenever I try to switch the source from Greek to Japanese and try to type,
I only see Greek characters being typed (though then, the ‘;’ key, which is normally used for accents in Greek doesn’t seem to work).

Originally, I thought it had to do with ibus-kkc, which is used for Japanese (Kana Kanji), but then I tested switching between:

  • English (US & UK)
  • Greek
  • Arabic
  • French
  • Japanese (Kana Kanji)
  • Chinese (Intelligent Pinyin)

The only switches to Japanese I found to have problems, where from Greek and Arabic, where I continued to see Greek/Arabic text respectively being typed (So… maybe it concerns non-Latin alphabets?). But, at the same time, the same bug occurred switching from Arabic/Greek to Chinese.