Cannot use !heap -flt s in WinDbg Preview

I am trying to debug a memory leak with WinDbg Preview (the Windows Store application).

I can execute !heap -s to obtain the list of heaps, then !heap -stat -h <address_of_a_heap> to get statistics of the used memory by object, but when I try to list all instances of specified size using !heap -flt s 100, I get

HEAPEXT: !heap invalid option flag '-l'
Platform dependent usage:             
THIS EXTENSION SUPPORTS THE SEGMENT HEAP AND THE NT HEAP

The same commands work as expected in the classic WinDbg. I also get different output from the !heap -stat -h command for one and the same heap - e.g. in the classic WinDbg the output is a table with objects grouped by size.

Is there additional configuration that should be done to enable these commands?

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