Google indexes duplicate pages, besides the canonical tag

Question

Hello

This page:
https://learn-greek-online.com/ask-greek/1089/possible-matthew-actually-questions-jesus-instead-statements?show=1095

has a canonical tag :
<link rel="canonical" href="https://learn-greek-online.com/ask-greek/1089/possible-matthew-actually-questions-jesus-instead-statements">

However if I google this, I do find it in the index (the duplicate page with the ?show=1095) :
site:https://learn-greek-online.com/ask-greek/1089/possible-matthew-actually-questions-jesus-instead-statements?show=1095

On the other hand, the following page is NOT included in the google index:
https://learn-greek-online.com/ask-greek/926/could-you-please-translate-this-sentence-for-need-homework?show=928

It is also correctly reported in google Search Console ( Coverage -> Alternate page with proper canonical tag ).

Any ideas why the first page (and about 1000 more of them) is wrongly reported by google as INDEXED?