After upgrading our farm to SharePoint 2019 I have problems with some timer jobs not running at all. I was able to fix this issue yesterday by following this answer on stackoverflow.
However during the night, the settings have been reset to
AllowContentDatabaseJobs. I wonder why this happens.
My best bet at the moment is that it has to do with the new min role model we introduced with the update. Our farm consists of two "Front-end with Distributed Cache" servers and two "Application with Search". The timer serice is installed and online on all four servers. AllowServiceJobs and AllowContentDatabaseJobs are true for the application servers and false for the front-ends.