Upsert and insert doesn't honor CAS

In the docs it's written that upsert, insert and remove honors the CAS.
This is incorrect.

"CAS is an acronym for Compare And Swap, and is known as a form of optimistic locking. The CAS can be supplied as parameters to the insert, upsert, replace, and remove operations. When applications provide the CAS, server will check the application-provided version of CAS against its own version of the CAS:"

please take a look on old docs
https://developer.couchbase.com/documentation/server/3.x/developer/java-2.0/documents-updating.html

"It also does not use the CAS value to handle concurrent updates, even when set on the document. Use replace instead."

Only Replace and remove ) functions honors the CAS value