We have tried to generate this issue on our local system. We have add some html content on infowindow and update the map. The infowindow content is not removed after updating.
Can you elaborate more about what process you are using when updating the content of infowindow, so we can try this on our local system.
We confirmed that HTML is not stripped out when we save the map. This is working fine on our end. Can you please create a support ticket so that our team can look into the issue for you and to fix the issue for you on priority?
What happens with HTML markup is that you CAN enter it into the information field in a location. The HTML works for a while in the front end.
However if you go back to the backend and edit the location the HTML is stripped out so all the markup’s dissapear, any image links dissapear and any url links dissapear and the mark up no longer works.
You end up having to save the markup in a text file off line, just in case it disspears in the back end, which is a real pain if you have 20-30 locations.
If you look at this page: https://datsys.org/map/ you can see the html markup working OK but in the back end it has dissapeared. I have put an image here to show you: