Issue #3436395 by kristiaanvandeneynde, xjm, smustgrave, gabesullice,...

Issue #3436395 by kristiaanvandeneynde, xjm, smustgrave, gabesullice, longwave, catch, effulgentsia, heddn, mcdruid, dww, bbrala, deviantintegral, greggles, benjifisher, drumm, larowlan, poker10: UserRolesCacheContext can lead to poisoned cache returns for user 1

(cherry picked from commit da8c7555)