Sonoma installed successfully on MBP 14,3 2017 with Touch Bar

Installation was smooth and easy for my point of view.... (oclp 1.4.3 / Sonoma 14.4.1).
And so far, everything seems working smoothly too.

Just a question, please: Is it normal the start disk appear (about 2 sec) each time the Mac start after shut down ?

https://preview.redd.it/4vltbbiypfwc1.jpg?width=2436&format=pjpg&auto=webp&s=f037703c95ee83cbcdd13ae487329514f513f2b1