Not sure if this is the issue. I am having this with Chrome-based browsers. Though I did check Firefox Focus (always on Android) and I have the same issues there as well.
Interestingly various Discourse forums work (Elektronauts, blokas.io) so maybe it really is a matter of which version one is running.
Interestingly also the official Discourse forum does not work, giving me the same blank page as lines.
I was looking at where to file a bug report to the discourse team… but I can’t seem to figure that our. I can’t find the “issues” tab on their github page.