Has the token length and formatting been updated recently with the YouTube data api?

I left an inquiry using Google Translate.Please understand even if you are not familiar with English.

We found a change related to the access_token value while accessing the YouTube API and sent an inquiry.

I used the 'https://accounts.google.com/o/oauth2/v2/auth' YouTube API.

I get data with return response 'access_token'.

However, recent token data length changesPreviously 165 characters, now 220 characters

I would like to know if there are any changes in this regard.