[2.2 backport] Fix highly embarrassing mistake in patch transformation #6183
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2.2 version of #6182. This code was supposed to have been quite battle-tested, but of course it hasn't been owing to this error.
The fix in #6182 is for everywhere - I propose limiting it slightly in 2.2.2 to be for Windows-only, to remove the risk of 2.2.2 causing unexpected regressions on non-Windows platforms.