Have the same problem with spring boot 3.1.x (updated hibernate version to 6.2). My definitions of TINYINT UNSIGNED & SMALLINT UNSIGNED stopped working. I resolved it by changing definitions to TINYINT(3) UNSIGNED & SMALLINT(5) UNSIGNED, which sets the display width of the columns and has nothing to do with value ranges. More can be found in official mysql 8 doc here.

Found nothing in the changelog of version 6.2 matching my database (MySQL 8).