SignalK not sending $GPGSV (sats in view) to Cpn

[paul42]

Cpn connection to TCP 10110 only with no input filtering:
SignalK "Convert SignalK to NMEA0183" active with all ticked
Cpn Debug window shows Received messages:  GGA, GLL, RMC, VTG, ZDA
GPS signal indicator (top right) shows bars for signal ok, dashboard shows position, SOG & Compass but no Sat status. The ZDA is presumably because I have the set system Time Plugin active in SignalK.

If I de-activate the SignalK "Convert SignalK to NMEA0183" Plugin I receive nothing at all in the Cpn Debug window
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Cpn connection direct to serial port only with no input filtering:
Cpn Debug window shows Received messages: GGA, GLL, RMC, VTG, GSV
GPS signal indicator (top right) shows bars for signal ok, dashboard shows position, SOG, Compass and Sat Status

From this it seems you need the Plugin to convert to NMEA0183 to be active for Cpn to see anything & the GSV sentence is not listed in this plugin so presumably that's why I don't see it via SignalK.

Or maybe I got something else wrong somewhere?

Cpn V5.0.0
SIgnalK v1.24.0

Thanks, Paul