Do the same clr type check when mapping "text" as what we do for other store type mappings. This allows conversions do work better (e.g. originally a mappingInfo with a System.Char type was passed in with store type of "text" and a variable length or unbounded string type was returned but with clr type of System.String. Going with the extra checked returns null and gets EF Core to find a converter and then do the mapping again on the converted type

src/EFCore.Jet/Storage/Internal/JetTypeMappingSource.cs

@@ -275,9 +275,20 @@ namespace EntityFrameworkCore.Jet.Storage.Internal
                 if (storeTypeNameBase!.Equals("text", StringComparison.OrdinalIgnoreCase) &&
                     !mappingInfo.IsFixedLength.GetValueOrDefault())
                 {
-                    return mappingInfo.Size.GetValueOrDefault() > 0
-                        ? _variableLengthUnicodeString
-                        : _unboundedUnicodeString;
+                    if (mappingInfo.Size.GetValueOrDefault() > 0)
+                    {
+                        return clrType == null
+                               || _variableLengthUnicodeString.ClrType == clrType
+                            ? _variableLengthUnicodeString
+                            : null;
+                    }
+                    else
+                    {
+                        return clrType == null
+                               || _unboundedUnicodeString.ClrType == clrType
+                            ? _unboundedUnicodeString
+                            : null;
+                    }
                 }
 
                 if (_storeTypeMappings.TryGetValue(storeTypeName, out var mapping)