Search Autocomplete

Until version 5.1 the autocomplete/autosuggest function in the searchbox in the top bar worked perfectly.

E.g. someone searched for the document (attachment) "VL_Investitionsantrag_V2.0.pdf" and started to type "inve" then it automatically showed up the attachment and you could directly go to the attachment page.

Now it doesn't work anymore and you have to type "vl_inve" to get the result.
Please see screenshots.

Our users are very unhappy with this development. Please help us to fix this problem.

Thank you in advance!