Hello Rajan
Welcome to Microsoft Q&A Platform, thanks for posting your query here.
Please try these troubleshooting steps and see if it helps resolve the issue:
-Can you please make sure that the Remote desktop client is update to the latest version.
-One more possible reason could be related to graphics driver, you can also try disabling hardware acceleration in the Remote Desktop client settings.
-You can try disabling the UDP protocol in the Remote Desktop client settings.
Lastly, you can try resetting the Remote Desktop client settings to default.
If none of these troubleshooting steps help, as mentioned by Timmy in the previous response, this could be a Bug with remote desktop client.
Hope this Helps.