"connect to dataset" stopped working on live site

I tried to take the problem to the most basic level, I have a page with one element only connected to a dataset, preview works but live site keeps the default “Heading 1”, the sandbox dataset is synced to live version, currently there is no code on the page and I also tried making a new dataset and connecting there and it didn’t work either. Duplicating the whole site seemed to fix the issue but I prefer to have the original one and would also like to see what the problem is so it doesn’t happen again


^ here you can see text connected to dataset

^preview works fine

live site stopped working. When it first happened, it happened randomly without me changing anything on the page. Is it something obvious I’m missing, site is published obviously

Forgot to mention that making the dataset “write only” removes the text completely from both preview and live site (as it is supposed to, I think)