As a relativistic correction for electron-electron interaction, the Breit interaction (BI) has gradually become an indispensable factor in the study of medium- to high-Z atomic or ionic systems, with its effect even surpassing that of the Coulomb interaction^[1]. Over the past few decades, the effects of the BI on the angular distribution of Auger electrons and the dielectronic recombination resonance strengths have been extensively explored in fundamental research on atoms and ions^{[2, 3]}. We calculate the angular distribution of Auger electrons following dielectronic capture and the resonance strength of dielectronic recombination for hydrogenlike Sn⁴⁹⁺, Cs⁵⁴⁺, Nd⁵⁹⁺, Ho⁶⁶⁺, and W⁷³⁺ ions using the Flexible Atomic Code under the conditions with and without the inclusion of the generalized Breit interaction (GBI), respectively. This study has shown that the effect of GBI on the resonance strength of the single [2s_1/22p_1/2]₁ resonance is negligible but induces a remarkable modification exceeding 50% on the angular distribution of Auger electrons emitted from [2s_1/22p_1/2]₁ at 0° and 180°, significantly reducing the anisotropy of Auger electrons. This effect on the resonance strength and the angular distribution stems from GBI exerting a pronounced opposite effect on the population of magnetic sublevels