[RSS Feed/News] Any reason why count($xf.vars.posts) > 10 would not work in thread_view sidebar widget?

[XenForo]

With count($xf.vars.posts) > 10 in the display condition, even if I use 1 instead of 10, the widget does not show in thread_view.
If I empty the display condition field, the widget shows.
What am I missing please?

Thanks.

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