I'm unable to expand the reply at the bottom of this conversation and it's unclear why. Tapping it shows the spinner to indicate it's trying, but then nothing. This behaviour occurs on iOS and Firefox on desktop.
This is definitely a Lemmy bug. We use child_count to determine if there are unloaded comments, but child_count is incorrect in this case. (says 3 children, only 2 returned)
Thereโs a badge on your settings. You either need to update or setup you WAP. You may also want to look into using the native app versions available for iOS and Android.