Sfizz and Ardour on AV Linux

With the AVL version of Ardour (9.2.18), the following happens with sfizz, but not with other instrument plugins:

sfizz seems to work fine, but when recording, once you press stop (using the unchanged default key binding Space), the capture is deleted immediately without any prompt to save it. The take is painted onscreen in the usual way as it’s performed, but once Space is pressed, the playhead returns to zero (AutoReturn is set), and the take has disappeared. Unchecking AutoReturn has no effect.

While this sounds like an issue with the sfizz plugin, and thus beyond the remit of Ardour, it’s a bit surprising that retaining the capture should seem to be within the control of sfizz.

Other instruments like Yoshimi seem to work correctly. I haven’t lost anything that matters, but are there any suggestions about what might be happening or how to get around this?

TIA

Before assistance is given (or not) by the Ardour devs I want to clarify that the current AVL Ardour package was a nightly because of issues in the 9.2 release, secondly I always wrap Ardour bundles in a Debian Package, this is not a self-compiled package, it is a bundle albeit a Nightly one…

What version of SFizz is this? Have you tried an updated Package from the SFizz Developers by chance? TBH I haven’t had a lot of good luck with SFizz in the limited times I’ve used it, lots of crashes etc…