Change in websearch between 8.5.0 and 8.5.1

Following upgrade aof a webserver from 8.5.0 to 8.5.1 we discovered that the custom search function using the SearchView&Query function stopped working (it returned 0 results)The exact string being used was:

http://www.serv.com/db.nsf/viewname?SearchView&Query=Field+fname+contains+mysearch&count=20&start=1

This works just fine in 8.5.0

However in 8.5.1 the words FIELD and CONTAINS must be in upper case.

My question is either why does it work in 8.5.0 or why has functionality changed in 8.5.1

Subject: reserved words must be in upper case

FIELD must be in upper case… see SPR PALT7YMPC9

Subject: …however, this doesn’t work in 8.5.2…

In 8.5.2, changing the reserved words to uppercase doesn’t help, either.

However, using brackets around the field value does, so I’m using a URL similar to the following:

?SearchView&Query=%5Bmodel%5D%3DBR549%20and%20%5Bserial%5D%3D123456 - (which equates to ‘?SearchView&Query=[model]=BR549 and [serial]=123456’)