This is a really strange bug.
I'm using Opera Mini version 70.0.2254.66376 on Android - Device is: Samsung S20 FE.
The moment I switch on Data Saving Mode to Automatic then I cannot login the site https://www.oneday.com.hk/ - The strange thing is that every other part of this site works - it's only when I try to login then the problem arises.
The login page is:-
https://www.oneday.com.hk/en_US/login/user/
And it gets stuck on this loading screen:-
[image removed - don't post images showing your username online]
I'm a developer and I am getting a lot of pressure from my boss to sort this out.... Can somebody with technical knowledge advise what might be causing this? and How to resolve? Are there certain headers I can change or json formats for the APIs?