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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
That's a bit strange - not sure what to suggest to be honest. It could be the new strip is a different type and the timings are subtly different so they can't be chained.
On the WS2811 once the signal goes into the first led I believe it's reformed by it - so the issue probably can't be fixed by anything on the Espruino side (but maybe putting the new strip first would fix it?).
On the WiFi you should be able to use any SPIx_MOSI pin, so could you connect the second strip to its own pin?