Snowflake had wrong number of segments

Gemini 2.5 (w/ Nano Banana)

Running on web, Firefox Browser

I requested a "Christmas Snowflake". I got a snowflake with 8 segments. Everyone knows a snowflake is six-sided. I rewrote the prompt, asking for a "Christmas snowlfake with 6 arms". I got a 5-sided snowflake. I tried again and actually got a 6-sided snowflake.