[BUG] test for added/updated fields faulty during update

[JoernBerkefeld]

Is there an existing issue for this?

• [X] I have searched the existing issues

Current Behavior

fields seem to be added twice. they already exist (im assuming based on the deploy-file) and then they are added from cache again by DataExtension.#attachFields(). When DataExtensionField.prepareDeployColumnsOnUpdate() later checks for changes it removes the not-changed fields once but not the second "version" of it.

Expected Behavior

correctly recognized what fields are added or updated and which one are not needed anymore

Version

6.0.1

Participation

• [X] I am willing to submit a pull request for this issue.