It seems, that when in Standard search mode and search query includes a symbol "0" (number zero) plus some other symbol, the result is either 0 found files or at least some matching files are omitted in the result least.
However XY finds those files, which includes search query words at least twice.
scale 0
it will find files with name "aaa scale aaa 2000", but not "aaa scale 2000".
Another example: with the query
aaa 0
it will find the file "aaa 000.txt" and aaa 002.txt, but not the file "aaa 2000.txt" nor aaa 200.txt
One more: with the query
aaa 0
you will get the file "scale aaa 002.txt", but not "scale aaa 002.txt (that is if the filename begins with one of searchwords).
And so on. These were only some examples, actually one can easily generate them much more himself. I'd dare to recommend to re-check twice the whole Standard search section's code.
Thanks!
XYplorer Beta Club