Secondary axis information for charts is lost when processing/saving an xlsx. Simple test case attached. Note that the temperature secondary axis has its data switched to the time data after saving.
Thanks for template file.
After an initial test, I can find the issue as you have mentioned. I have logged a ticket for the issue with an id: CELLSNET-30308. We will look into your issue to figure it out soon.
Please try the fix version v18.104.22.168, we have fixed the issue now.
This patched version behaves as expected. Thanks.