"Add value" to phone field must not delete the existing value

I have an automation to consolidate some phone fields. From a second field into the other. I selected “add value”.

However, it deleted the already existing value. Reproducible.
I guess it shouldn’t?

image

I can see where it comes from - this is the API description:

“Note that the individual phone number entries contain an ID. Be sure to include them in updates, to keep existing phone entries. If you omit the ID, new entries will be created instead and the respective existing ones will be removed.”

This is fine for API, but not for the LowCode automation block.