"1 Reply", then disappears

[Moin]

I can

Seems they now disappear without clicking them.

@Moin

(4) While searching for examples here at meta, something drove me crazy: Sometimes reply indicators appear, but after clicking them, they disappear. Even refreshing does not bring them back. I think the posts are exactly at the preload border. So one was loaded before the other is loaded.
I recorded two examples. This is the link to the post of the first screencast. When I scroll through the topic, the reply indicator is displayed below the post. Sometimes I can even click on it, but at the end, it disappears.

I think the indicator isn’t suppressed until the post below is loaded. Once the posts below are loaded, the indicator disappears.