Same issue. Seems like Mapbox injects this style:

input:-webkit-autofill,select:-webkit-autofill,textarea:-webkit-autofill{animation-name:onbrowserautofillstart}input:not(:-webkit-autofill),select:not(:-webkit-autofill),textarea:not(:-webkit-autofill){animation-name:onbrowserautofillcancel}@keyframes onbrowserautofillstart{0%{animation-name:"onbrowserautofillstart"}to{animation-name:"onbrowserautofillstart"}}@keyframes onbrowserautofillcancel{0%{animation-name:"onbrowserautofillcancel"}to{animation-name:"onbrowserautofillcancel"}}