We have the same issue among other things...none of which the tool hub fixes.

We run QB Desktop 2018 contractor version. It's in a Windows 10 VM (Version 1909; build [removed])  on Unraid. 

#The system crashes occasionally normally when we are viewing an old receipt. Also once it crashes it comes back up as single user mode some times. It crashes at other times for inexplicable reasons. 

#upon migrating to the VM...we discovered that our Loan Manager had lost all information.

#I did discover that after I had initially setup the vm and stopped hosting on the prior computer somehow the old host computer reverted back to thinking it was the host machine which was causing network issues. I even went thru the trouble to completely uninstall it on the old host machine and reinstall choosing the correct settings and it still did it. 

#Using the database server manager in the VM...produces a Windows Firewall issue but does not suggest a fix and does not fix it. I've researched this and went thru a number of steps to make sure Windows firewall isn't causing the issue to no avail. 

#Also in the past we have had issues with email...the VM refuses to see Thunderbird after a number of attempts of reinstalling it and/or Quickbooks. The client computers when we sign in...Thunderbird is given as an option so it's working now. Just strange.