MR page constantly shows AJAX error banners

Error banners like "Failed to fetch comments", etc.. constantly show up in MRs even when they were loaded successfully.

I can reproduce by reloading the page and switching to another tab while the requests are going on. When I switch back, I see the error even though the comments are loaded fine.

Screen_Recording_2020-03-12_at_2.27.16_PM

I'm on Firefox 73.0.1. And for now, I've only been able to reproduce it in MR pages.