The subtitle display shows the object property name instead of the actual value.
I have noticed this for:
subtitles.entity.player.attack.sweep
subtitles.entity.boat.paddle_water
subtitles.entity.drown.ambient_water
There may be more, but these are the only ones I have come accross
When this happens, please force a crash by pressing
F3 + Cfor 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.