IOSDriver is able to find an element with FindElementsByAccessibilityId but not with FindElementByAccessibilityId

[timonHa]

The problem

IOSDriver is finds one element with FindElementByAccessibilityId. With method FindElementByAccessibilityId IOSDriver is unable to find the element.

var tests = Driver.FindElementsByAccessibilityId("Btn");

var test = Driver.FindElementByAccessibilityId("Btn");

Environment

• Appium version (or git revision) that exhibits the issue: 1.15.1
• Last Appium version that did not exhibit the issue (if applicable): 1.13
• Desktop OS/version used to run Appium: macOS 10.15.2
• Node.js version (unless using Appium.app|exe): 12.14.1
• Npm or Yarn package manager: 6.13.4
• Mobile platform/version under test: iOS 13.3
• Real device or emulator/simulator: real device
• Appium CLI or Appium.app|exe: Appium.app

Link to Appium logs

https://gist.github.com/timonHa/27b59a107baa0860f7dc9fb96cc4c267

[mykola-mokhnach]

According to the WDA code this might happen if the exists property of the found element is falsy. Although, this property is not verified if the query is executed for multiple elements. Could it be the case here? What is the page source output and the device log when both queries are being executed?

[timonHa]

Sry, I'm new to testing iOS Devices with Appium.

• How can I ceck the exists property of the found element?

• It is not possible to get the page source output "Cannot get 'xml' source of the current application". Like in Cannot get 'xml' source reported while trying to get PageSource for iOS13 #13595.
  upgrading to appium 1.16.0 is not possible, because the version is no longer
  available.

• How can I get the device log? Get Logs?

[mykola-mokhnach]

upgrading to appium 1.16.0 is not possible, because the version is no longer
available.

It does exist and could be installed via npm

Regarding the other questions - feel free to ask them at Appium forum
Here is the place for issues.