Not sure if Luis is experiencing the same results as I am, but the answer in the referenced discussion doesn't work.
List Name: Applications_list1
List option: Pega
Field Name to become visible when option is selected: PegaOptions
Expression in Visibility section of PegaOptions: $(if IsRegexMatch(Applications_list1, /Pega/i) then true else false)
Result: See above screenshot.
If we put $(if Applications_list1=="Pega" then true else false) the field remains hidden no matter what, even if another option in the list is selected, or if Pega is deselected.
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The visibility expression functionality for lists seems to be an issue. It works fine for combo fields. I've opened a ticket with Support and they are passing on to Dev. I would encourage you to do the same so they don't ignore the issue as a one-off.