Same a before BS5. The form is generated through the form generator in Input Filed Generators.
It may not be an issue with that, but I’m just trying to give you as much info as possible:
Working on MAC by the way.
Now I swapped back to previous version it is working again, so a least I can carry on with my work.
I was not sure if it was anything to do with BS as the site I was working on all the previous pages with ‘Form-Floating’ worked no issues.
It was only a new page created with 4.8.0.
When I swapped back to the previous version I had to re-run the Input Field Generators to get it to work.