Is anyone able to replicate this?  I'm currently on version 2019 SP5.

I'm creating a search with the following parameters:

        Dim search As IEdmSearch8 = vault.CreateSearch
        search.FindFiles = True
        search.FindFolders = False
        search.Recursive = True
        search.FindLockedFiles = True
        search.FindUnlockedFiles = True
        search.StartFolderID = vault.GetFolderFromPath(FOLDER_NAME).ID
        search.SetToken(EdmSearchToken.Edmstok_AllVersions, False)
        search.AddVariable2(VAR_NAME, VAR_VALUE, EdmVarOp.EdmVarOp_StringEqualTo)

When searching for a string variable value using the options EdmVarOp_StringEqualTo, if the value begins with the letter "N", I get no search results.

If I use the EdmVarOp_StringContains option, the search returns results as expected.

It is incredibly bizarre.