SessionNotCreatedException using Selenoid and chrome version 56.0

Issue

I would need some help getting the RF-SeleniumLibrary work with Selenoid. I am testing a website with two versions of Chrome: v103 & v56. The keyword works for newer versions of Chrome, but fails for older ones (56.0 for example. I think it has something to do with the parameters I am setting, which are not compatible with such a low version, as I am able to start chrome w/ version 56.0 manually in the Selenoid-UI.

This is the keyword I use to open the website on a remote browser using Selenoid:

Steps to reproduce the issue

Keyword:

Open Specific Browser Version
    [Arguments]    ${url}    ${browser}    ${version}
    ${caps}=    Create Dictionary    version=${version}
    Wait Until Keyword Succeeds
    ...    30 seconds
    ...    5 s
    ...    Open Browser
    ...    url=${url}
    ...    browser=${browser}
    ...    remote_url=${selenoid_server}
    ...    desired_capabilities=${caps}

Call it:

Open Specific Browser Version    https://google.come    chrome    103.0

Error messages and additional information

This works with Chrome 103.0, but results in an error with Chrome 56.0:

| FAIL |
Keyword 'frontend.Open Browser To Dashboard' failed after retrying for 30 seconds. The last error was: Keyword 'Open Browser' failed after retrying for 30 seconds. The last error was: SessionNotCreatedException: Message: session not created exception: Missing or invalid capabilities
  (Driver info: chromedriver=2.29.461571 (8a88bbe0775e2a23afda0ceaf2ef7ee74e822cc5),platform=Linux 5.18.11-100.fc35.x86_64 x86_64)

If I change the desired_capabilities parameter to options, the Chrome v103.0 also does not work. Both versions throw the following error:

Keyword 'frontend.Open Browser To Dashboard' failed after retrying for 30 seconds. The last error was: Keyword 'Open Browser' failed after retrying for 30 seconds. The last error was: AttributeError: to_capabilities

However, using selenoid-ui, it's possible to start a Chrome v56 instance manually, so I guess I have some wrong parameters set.

Selenoid-UI console log:

Initialize...

Connecting to ws://127.0.0.1:8080/ws/logs/742684cc34796c87fd0145c735281faa...
Connected!

 --- x11vnc loop: 1 ---

Starting ChromeDriver 2.29.461571 (8a88bbe0775e2a23afda0ceaf2ef7ee74e822cc5) on port 4444
All remote connections are allowed. Use a whitelist instead!
[0.036][INFO]: COMMAND InitSession {
   "capabilities": {
      "alwaysMatch": {
         "browserName": "chrome",
         "browserVersion": "56.0"
      },
      "firstMatch": [ {

      } ]
   },
   "desiredCapabilities": {
      "browserName": "chrome",
      "enableVNC": true,
      "labels": {
         "manual": "true"
      },
      "name": "Manual session",
      "sessionTimeout": "60m",
      "version": "56.0"
   }
}

Can someone maybe help me out? :) Thanks & BR

Environment

Browser: Name and version (Usually available from the about dialogue.)
Browser driver: Name and version
Operating System: Name and version (Linux, Ubuntu 18.04)
Libraries

• Robot Framework: 5.0.1
• SeleniumLibrary: 6.0.0
• Interpreter: Python 3.10

Reproduce the failure with the Robot Framework keyword “Open Specific Browser Version,” focusing on its Open Browser call, desired_capabilities, and the Chrome 56.0 error. Compare the capabilities sent for Chrome 103.0 with the Selenoid-UI session details; done means determining the compatible configuration or documenting that limitation for SeleniumLibrary 6.0.0.