When there is a fixed query on a table and the query contains an OR condition, if Group By is applied on a field, the list shows unexpected results.
Steps to Reproduce
Navigate to Incident > All.
Make sure that there are at least a few incidents with Caller as two or more different users.
Click the filter icon and add the filter [Caller][is][Bow Ruggeri] (or any other user having multiple incidents).
Click the OR button at the top. (DO NOT use the one on the side of the filter you added.)
Add the filter [Caller][is][Bud Richman] (or any other user having multiple incidents).
Modify the URL parameter from "sysparm_query" to "sysparm_fixed_query" and reload the page.
Note that the filter is no longer changeable.
Right-click on the State field and choose Group By.
The list will be grouped as usual, with a group for each state, but, under each group, incidents from multiple states will be displayed rather than incidents from only that state.
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Related Problem: PRB1093125