Removing words from your personal dictionary causes Hunspell to not detect a word as a spelling mistake (highlighted in red)

Can reproduce CR. Though reloading the app completely fixes it, so it's only temporary. canary build 574 (816263e), Electron 41.2.2, Linux 7.0.3-1-cachyos-bore-lto (x64), desktop canary 0.0.119, locale fr