Quartz.Serialization.SystemTextJson

This package is empty. The System.Text.Json job store serializer was folded into Quartz in 4.0, where it is the default — nothing has to be referenced or registered to get it, and JsonSerializationException is in the Quartz package now. Remove this reference, keep Quartz, and read the migration guide for the rest of the upgrade.

It is published at every 4.x version for one reason: a dependency bot that updates Quartz and this package as one group resolves that group to the newest version every member has. With nothing under this id above 3.20.1 the group stops there, and the 4.0 pull request the bot had already opened is closed as superseded. Quartz.OpenTracing and Quartz.OpenTelemetry.Instrumentation deliberately have no such package: neither has a 4.x replacement, and an empty one would hide that rather than say it.