Nintendo Switch Pro Controller losing input during rumbling

Your system information

• Steam client version (build number or date): Jul 18 2019 at 00:11:36
• Distribution (e.g. Ubuntu): Arch
• Opted into Steam client beta?: Yes
• Have you checked for system updates?: Yes

Please describe your issue in as much detail as possible:

When any action causes the Switch Pro Controller to rumble, all input is frozen in its last state. This is when using the Steam Input configuration to emulate an X360 controller, for both native and wine games.

Examples:

1. In DMC5 in Proton, if I tap left or right on the menu to enable rumble, it continually toggles it until I unplug the controller.
2. Searching for scan points from the ship in Mass Effect Andromeda via wine (using Switch controller mapped in Steam Big Picture -> Base Configuration -> Desktop Configuration), when I hold ZR for scanning it rumbles to let you know how close you are - at this point all input is lost until I hit something on the keyboard to interrupt the rumble (such as esc to the menu or whatever button does the same thing as ZR / right trigger on the gamepad), at which point input on the controller works again.

Update: Not sure about native Linux actually on further testing, this might only impact Wine/Proton. I cannot duplicate the error on html5gamepad.com even when it's detecting my controller as an X360 pad via Steam Input.

No source file or test is identified. First reproduce the freeze with the Switch Pro Controller under Steam Input using DMC5 or Mass Effect Andromeda through Proton or Wine, then compare it with html5gamepad.com; done means rumble no longer leaves controller input stuck.