ocis: etags don't propagate correctly sometimes

The following feature failed in recent nightly https://drone.owncloud.com/owncloud/ocis/13031/46/6

Scenario Outline: copying a file inside a publicly shared folder by public changes etag for the sharer # /srv/app/testrunner/tests/acceptance/features/apiWebdavEtagPropagation2/copyFileFolder.feature:121
    Given using <dav_version> DAV path                                                                   # FeatureContext::usingOldOrNewDavPath()
    And user "Alice" has created folder "/upload"                                                        # FeatureContext::userHasCreatedFolder()
    And user "Alice" has uploaded file with content "uploaded content" to "/upload/file.txt"             # FeatureContext::userHasUploadedAFileWithContentTo()
    And user "Alice" has created a public link share with settings                                       # FeatureContext::userHasCreatedAPublicLinkShareWithSettings()
      | path        | upload |
      | permissions | change |
    And user "Alice" has stored etag of element "/"                                                      # WebDavPropertiesContext::userHasStoredEtagOfElement()
    And user "Alice" has stored etag of element "/upload"                                                # WebDavPropertiesContext::userHasStoredEtagOfElement()
    And user "Alice" has stored etag of element "/upload/file.txt"                                       # WebDavPropertiesContext::userHasStoredEtagOfElement()
    And user "Alice" has stored etag of element "/upload/file.txt" on path "/upload/renamedFile.txt"     # WebDavPropertiesContext::userStoresEtagOfElementOnPath()
    When the public copies file "file.txt" to "/renamedFile.txt" using the new public WebDAV API         # PublicWebDavContext::thePublicCopiesFileUsingTheWebDAVApi()
    Then the HTTP status code should be "201"                                                            # FeatureContext::thenTheHTTPStatusCodeShouldBe()
    And these etags should have changed:                                                                 # WebDavPropertiesContext::theseEtagsShouldHaveChanged()
      | user  | path                    |
      | Alice | /                       |
      | Alice | /upload                 |
      | Alice | /upload/renamedFile.txt |
    And these etags should not have changed:                                                             # WebDavPropertiesContext::theseEtagsShouldNotHaveChanged()
      | user  | path             |
      | Alice | /upload/file.txt |

    Examples:
      | dav_version |
      | old         |
      | new         |
      | spaces      |
        WebDavPropertiesContext::theseEtagsShouldHaveChanged
        The etag '"f1767bc7cff8f9573775e70ead429675"' of element '/upload' of user 'Alice' did not change.
        Failed asserting that 1 matches expected 0.