Remote Desktop for Mac 10.9.4 often causes spinning wheel of death when copying from Windows machine

Starting in the last version or two, I frequently get the "spinning wheel of death" after using Remote Desktop for Mac to copy from the remote Windows client. This manifests when I switch back to the mac and try to switch to Slack -- Slack will be frozen for 30 seconds to several minutes with the colorful spinning pinwheel. 

Many people have been experiencing this issue, both recently and in the last several years:

https://techcommunity.microsoft.com/t5/azure-virtual-desktop-feedback/copy-and-paste-from-microsoft-remote-desktop-to-mac-causes/idi-p/3947326

https://techcommunity.microsoft.com/t5/azure-virtual-desktop-feedback/microsoft-remote-desktop-for-mac-copy-and-paste-works-a-while/idi-p/3930905

https://learn.microsoft.com/en-us/answers/questions/565240/microsoft-remote-desktop-freezes-constantly-apple

Please look into this, it's a productivity killer. And if there's anything I can grab for you that will help (like a snapshot of a process using  the Mac activity monitor) please let me know.

EDIT: I just attached a sample and spindump of Slack (the macOS process that gets the spinning wheel of death after copying text on the remote windows machine).