[Bug]: Mouth doesn't move when using iFacialMocap

[irgendwr]

Description

When using iFacialMocap as a tracker, the mouth doesn't move.

Steps to reproduce

1. Load a model, e.g. AliciaSolid_vrm-0.51.vrm
2. Enable iFacialMocap tracker
3. Try moving the mouth

App version

0.9.0

Operating system

Linux

Relevant log output

No response

Additional information

@you-win via Discord:

ifm, meowface, and vtube studio all rely on perfect sync blendshapes being present
yep, just confirmed it https://github.com/vrm-c/vrm-specification/tree/master/specification/0.0#blendshape-groups-jsonextensionsvrmblendshapemasterblendshapegroups
and i guess there's no fallback yet for non-perfectsync models

[you-win]

Thanks for the report!