Loading more string list items sometimes fails

[mathjazz]

As reported by @gion-andri on Matrix:

I have very often issues with loading new pages in Pontoon. Is this a know issue? Or is this only an issue on my machine?

• sometimes this loading placeholder is there for some seconds and is then replaced with the content (=woks correctly).
• often the placeholder is there forever (like in this screenshot).
• and sometimes the placeholder is there and disappears after some seconds (but falsely). with falsely I mean: I see this in the unapproved strings view, I scroll to the bottom, the loading placeholder is shown and disappears after some seconds, so you could think, that there are no more unapproved strings. but on browser reload, the view has a lot of other unapproved strings again.

I mostly see the issue on the list of unapproved strings; so I can't reproduce it right now, as I don't have enough suggestions in our projects right now. But I can try to make a vid the next time I review suggestions.

Its not a big deal; a browser reload fixes it. I was just curious, if this is only me having this issue or others as well.

Confirmed @ItielMaN:

Happens to me as well, only when the page has been open a long-ish time, and then you scroll down.
I just give up and reload the page

And @Fjoerfoks:

Seeing that too every now and then, especially when loading more than ~50 untranslated strings. Sometimes it loads after a moment, sometimes I need to reload the page. No big deal though.