Different data when tests run in parallel

[e180973]

Using filler.SetRandomSeed(1000).Setup() my test consistently generates identical data for all fields, as long as i specify certain values like .OnType().Use(DefaultDateTimeOffset).

However, when my tests are run in parallel i seem to get different results for strings and ints. My workaround right now is locking string/int values like this
.OnType().Use(true)
.OnType<bool?>().Use(true)
.OnType().Use(1)
.OnType<int?>().Use(1)
.OnType().Use("string")
.OnType<string?>().Use("string")

This is "ok", but then I don't quite understand the point of SetRandomSeed. Is this the way it's supposed to work?