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We show that perturbations of a scalar field in the background of the blackhole obtained with the Starobinsky-Bel-Robinson Gravity is unstable unless thedimensionless coupling $\beta$ describing the compactification of M-theory issmall enough. In the sector of stability quasinormal spectrum show peculiarbehavior both in the frequency and time domains: the ringing consists of twostages where two different modes dominate. The WKB method does not reproducepart of the spectrum including the fundamental mode, which is responsible forthe first stage of the ringing. As a result, the correspondence between thehigh frequency quasinormal modes and characteristics of the null geodesicsreproduces only one branch of the eikonal spectrum. The frequencies areobtained with the help of three methods (Frobenius, WKB and time-domainintegration) with excellent agreement among them.

Black holes in Starobinsky-Bel-Robinson Gravity and the breakdown of quasinormal modes/null geodesics correspondence