Remove parentheses of sequence expressions breaks code

Prettier 1.19.1 Playground link

--parser babel

Input:

export default (1, 2);

Output:

export default 1, 2;

Second Output:

SyntaxError: Unexpected token, expected ";" (1:17)
> 1 | export default 1, 2;
    |                 ^
  2 | 

Expected behavior:

A case found in #7470

[thorn0]

I wrote yesterday, No answer so far.

[alexander-akait]

Honestly, I do not know, maybe this really only works for the master, need to write in support