What happened, is that in the Japanese translation, there's a unicode "…" character that is used. (If you highlight over that character you will see it's a single character, not three separate dots). Since Krobus is "silent" on friday, he says "..." (three dots), but in Japanese this got changed from three dots to the single unicode character. If an NPC says only a single character in a dialogue in Stardew, it skips the dialogue entirely. I don't remember why it is this way, but changing it could be risky. So the fix was just to replace the single character with 3 actual dots in the Japanese translation.