[FS#151] RST packet as response to SYN is not forwarded to sender?

[LEDE Bugs]

The following task has a new comment added:

FS#151 - RST packet as response to SYN is not forwarded to sender?
User who did this - xnoreq (xnoreq)

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Works with LEDE 17.01 "Reboot".
The router now forwards the RST packet.

I'm not sure why this didn't work on openwrt. 
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=151#comment2457