Brackets are with background color

[Andrej2]

Hello
When I use syntax for SQL brackets have background color as in the picture. Do not know why.
But when I change it to T-SQL, bracket do not have background color.
How can I set SQL files open with T-SQL syntax, not SQL. Or would be better to fix the issue, how?

[deathaxe]

see also:

Issue: New SQL syntax highlighting breaks with SQL Server quoted names