Dates in queries are logged with `$date` and not `ISODate`

[WildDev]

I have downloaded a basic template from start.spring.io with the only dependencies spring-boot-starter-webflux and spring-boot-starter-data-mongodb-reactive to reproduce some weird behavior of the ReactiveMongoTemplate regarding the dates.

A basic query findByAddedBefore(Instant value) transpiles into a wrong query:
ReactiveMongoTemplate : find using query: { "added" : { "$lt" : { "$date" : "2025-12-09T23:53:38.977Z"}}} fields: Document{{}} for class: class com.example.demo.Buck in collection: buckets

While it would work correctly if it was instead:
{ "added" : { "$lt" : ISODate("2025-12-09T23:53:38.977Z") }}

I have also tested it with Date, LocalDateTime, OffsetDateTime, but still neither of them works.

buckets.zip

[mp911de]

I'm not sure I follow. Both, adding and querying works for me. The log output you see is the Java driver representation, not the Shell/BSON formatting.

[WildDev]

Yes, you are right. It seems to be my fault, sorry

[mp911de]

Thanks a lot for verifying. I've updated the title to reflect the actual issue and marked this ticket as duplicate of #4873