Virtual COM port issues

I'm running the latest version of Windows 11 ARM64 under the latest version of Parallels Desktop Pro on an Apple Macbook Pro M1 Max. I have 16 of RS232-to-USB virtual serial ports connected to USB docs that are connected to the Mac. Some are connected via single RS232-to-USB serial converters and 8 of them are connected via an 8-port RS232-to-USB serial converter. All the converters use FTDI chips. All of the ports are configured to automatically connect to Windows not the Mac. Everything works well, except for two issues:

1. When I reboot the virtual machine, some of the ports get reconnected to Windows, but others do not. I believe the difference is that the ports using single-port RS232-to-USB converters do get reconnected to Windows, but the ports using multiport RS232-to-USB converters do not (e.g., the 8-port converter and a couple of devices that appear as dual COM ports.) When I pull down the Devices->USB menu, some of the ports are checked and others are not. Once i check the unchecked ports, they're connected and all is well until the next time I reboot. Note that if I go into USB configuration, the ports that aren't checked are correctly designated to automatically connect to Windows, even though they don't.

2. If I exceed a certain number of virtual COM ports (not sure about the exact number) I get a message that there aren't enough virtual ports to be able support another one. I don't see why there should be any limit, but if there must be, could you raise it to at least 32 and preferrably 64?

Thanks.