Filters containing Swedish öäå stopped returning any results
For at least a week now, in some tenants, filters in verticals stopped showing any results for the values containing Swedish characters ö, ä, å. We have not done any changes to search configuration in any of the affected tenants (some continue to work correctly, no changes there either). These just stopped working. Steps I used to reproduce it: 1) Create a new communication site 2) Add single line text column to the documents library 3) Upload some test documents and tag them with "aaa", "bbb", "öäå" 4) Map newly created crawled property for that column to previously unused RefinableString managed property in the tenant search administration 5) Create a new vertical in the site and select newly mapped managed property as a filter 6) Reindex the library (after schema change) 7) Search for "*" in the site, switch to the new vertical 8) The new filter appears correctly, with all the values expected, but only selecting "aaa" or "bbb" shows correct results. Selecting "öäå" gives no results. What's interesting is that the indexing seems to be working fine, because when instead of filtering I use a query (by entering " RefinableString07=öäå " in the search box) I get the correct results. So it's only refining/filtering that breaks. Have there be any recent changes that could have caused that? We have many customers we have configured search for and some are now reporting that their filters that worked fine for a long time don't work anymore.