Saved object returned by ReactiveMongoTemplate.save(T) is different from the actual saved object in MongoDB for Instant field about spring-data-mongodb HOT 3 CLOSED

MongoDB truncates the precision to milliseconds as MongoDB uses millisecond precision in their temporal data types. Newer Java versions have introduced nano-second precision to Instant and other temporal types so this isn't really something we can fix. We also do not plan to load the object after saving it as it would significantly change application and performance behavior.

If you require the WYSIWYG perspective on your object, we suggest you either load the entity after saving it or provide an EntityCallback that truncates instants to milliseconds.

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Thanks, I will try use workaround instead.
However, shouldn't the document also make it clear since the return is not exactly the saved object?

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There are many ways to affect either the written Document (converters, entity callbacks, lifecycle events) or the entity without reflecting those changes in the other one.

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