The recently proposed effective equation of motion for the $4D$- Einstein-Gauss-Bonnet gravity admits a static black hole solution that has, like the Rissner-Nordstr\"{o}m charged black hole, two horizons instead of one for the Schwarzschild black hole.
This means that the central singularity is timelike instead of spacelike.
It should though be noted that in $D\geq5$, the solution always admits only one horizon like the Schwarzshild solution.
In the equation defining the horizon, the rescaled Gauss-Bonnet coupling constant appears as a new 'gravitational charge' with a repulsive effect to cause in addition to event horizon a Cauchy horizon.
On causal structure of $4D$-Einstein-Gauss-Bonnet black hole · Around
N. Dadhich, Probing universality of gravity, in Proceedings of the 11th Regional conference on Mathematical Physics, eds. S. Rahvar, N. Soodooghi, F. Shojai (World Scientific, 2005), [gr-qc/0407003]; Universalization as a physical guiding principle, [gr-qc/0311028]
2005
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T. Torii and H. Maeda, Spacetime structure of static solutions in Gauss-Bonnet gravity: Neutral case Phys. Rev. D 71
2005
Later among the works it cites.
N. Dadhich, On the Gauss-Bonnet gravity, Proceedings of the 12th Regional Conference on Mathematical Physics, M. J. Islam, F. Hussain, A. Qadir, R. Riazuddin and H. Saleem editors, pp.331 (World Scientific, 2006), [gr-qc/0509126]