Fix:
On Linux computer please go to below folder (or the respected folder for your particular deployment):
/etc/fmsoft/unigui/unigui_runtime/unipackages-7.5.1/themes
Rename Css folder to css. (That's why it works in Windows but not in Linux. Linux FS is case sensitive)
We will also fix it internally for the next build.
It should be something different.
Please uncheck option TerminateOnBrowserClose in MainModule. That's the only place that XHR is used while unloading the page.
This feature is introduced in 2018, but it has not affected uniGUI. I tested and still there are no side effects from this Chrome feature.
Can you please explain what you experience in your app?