atto_preview behat test is failing because of envbar overlay

[tsmilan]

root@51e567e598a8:/var/www/html#` vendor/bin/behat --config /var/www/behatdata/behatrun/behat/behat.yml /var/www/html/lib/editor/atto/plugins/preview/tests/behat/preview.feature --suite monasheass
Moodle 3.9.3+ (Build: 20201121), b997a4f20356e337d4c9a0ab4a86646233e8df12
Php: 7.3.26, pgsql: 11.7 (Debian 11.7-2.pgdg90+1), OS: Linux 5.4.0-65-generic x86_64
Server OS "Linux", Browser: "firefox"
Browser specific fixes have been applied. See http://docs.moodle.org/dev/Acceptance_testing#Browser_specific_fixes
Started at 08-02-2021, 08:55
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--- Failed steps:

001 Scenario: Click preview button and check activation # /var/www/html/lib/editor/atto/plugins/preview/tests/behat/preview.feature:16
      When I click on "Toggle preview" "button"         # /var/www/html/lib/editor/atto/plugins/preview/tests/behat/preview.feature:17
        Element is not clickable at point (660.25, 16.399993896484375). Other element would receive the click: <div class="envbar env0 fixed"></div>
        Command duration or timeout: 67 milliseconds
        Build info: version: '2.53.1', revision: 'a36b8b1', time: '2016-06-30 17:37:03'
        System info: host: '7ef302a1fcea', ip: '192.168.80.3', os.name: 'Linux', os.arch: 'amd64', os.version: '5.4.0-65-generic', java.version: '1.8.0_91'
        Driver info: org.openqa.selenium.firefox.FirefoxDriver
        Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=47.0.1, platform=LINUX, nativeEvents=false, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
        Session ID: 08e118a4-809a-4c98-8e44-a8f2220cc120 (WebDriver\Exception\UnknownError)

002 Scenario: Click preview look for iframe contents # /var/www/html/lib/editor/atto/plugins/preview/tests/behat/preview.feature:22
      When I click on "Toggle preview" "button"      # /var/www/html/lib/editor/atto/plugins/preview/tests/behat/preview.feature:23
        Element is not clickable at point (660.25, 16.399993896484375). Other element would receive the click: <div class="envbar env0 fixed"></div>
        Command duration or timeout: 67 milliseconds
        Build info: version: '2.53.1', revision: 'a36b8b1', time: '2016-06-30 17:37:03'
        System info: host: '7ef302a1fcea', ip: '192.168.80.3', os.name: 'Linux', os.arch: 'amd64', os.version: '5.4.0-65-generic', java.version: '1.8.0_91'
        Driver info: org.openqa.selenium.firefox.FirefoxDriver
        Capabilities [{applicationCacheEnabled=true, rotatable=false, handlesAlerts=true, databaseEnabled=true, version=47.0.1, platform=LINUX, nativeEvents=false, acceptSslCerts=true, webStorageEnabled=true, locationContextEnabled=true, browserName=firefox, takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]
        Session ID: cad4e6eb-971d-434c-8ec6-e0fc012f2120 (WebDriver\Exception\UnknownError)

2 scenarios (2 failed)
22 steps (14 passed, 2 failed, 6 skipped)
0m39.06s (47.18Mb)