just adding to the above - if i untick the box 'Cache front page' from W3TC's Page Cache settings page, the front page is not cached, as expected, which kinda works around the issue but i still can't figure out from docs whether w3tc_pgcache_flush_url() is supposed to be working with URIs which are not generated from WordPress Posts or Pages, and what is the $url parameter format supposed to be.
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