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The culprit is %iint that let the rest of the formula appear as a comment.

Here is a smaller example:

sage: f = polylog(3, x)
sage: f.integral(x)
-x*dilog(x) - (x - 1)*log(-x + 1) + x*polylog(3, x) + x
sage: f.integral(x, algorithm='fricas')
-x*%iint(x, -log(-x + 1)/x) - (x - 1)*log(-x + 1) + x*polylog(3, x) + x

The culprit is %iint that let the rest of the formula appear as a comment.

Here is a smaller example:

sage: f = polylog(3, x)
sage: f.integral(x)
-x*dilog(x) - (x - 1)*log(-x + 1) + x*polylog(3, x) + x
sage: f.integral(x, algorithm='fricas')
-x*%iint(x, -log(-x + 1)/x) - (x - 1)*log(-x + 1) + x*polylog(3, x) + x

The culprit is %iint that let the rest of the formula appear as a comment.

Here is a smaller example:

sage: f = polylog(3, x)
sage: f.integral(x)
-x*dilog(x) - (x - 1)*log(-x + 1) + x*polylog(3, x) + x
sage: f.integral(x, algorithm='fricas')
-x*%iint(x, -log(-x + 1)/x) - (x - 1)*log(-x + 1) + x*polylog(3, x) + x

Thanks for reporting, this is now trac ticket 28630.