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

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

(cherry picked from commit 7785f1a0)