Is it me or a bug with VNAV and RNAV with the WT CJ4?

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Using the Working Title 0.10.2 mod on the CJ4.

Route: LFMN/22L IRMA6X IRMAR UN853 MOLUS N871 TELNO TELN3M LSZB/14

Cruise FL240. In the flight plan I entered FL180 at MOLUS and RNAV descended to that fine as can be seen here with VPATH in green on the PFD.

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However it did not descend again in the flight and I had to switch to FLC mode to descend to TELNO. I programmed in 8600A TELNO but the aircraft just ignored it. VALTV was showing in the PFD with the correct altitude in magenta, but the plane did not descend.

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I had to switch to FLC and apply speed brake because I was then too high.

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At BIRKO the plane did not capture the Glide Path in RNAV mode even though GP was in green in the PFD the plane actually started climbing and was out of profile.

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I can’t work out if it’s me or a bug. Any ideas?

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From the working title cj4 user guide in known issues section:

User guide

‘If for whatever reason, you find that VNAV is not behaving as expected, try and turn it off and on again.’

Maybe that will solve your issue.

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Thanks, I repeated this flight and it worked OK, not sure what I did wrong.