CLAP support is unreliable

[swesterfeld]

I've tested two instrument CLAP plugins (SpectMorph / Apricot) with the following steps

• insert some notes in clip on master track
• create CLAP plugin on master track
• click on play (notes are being played)
• click on stop
• create new track
• insert some notes in clip on new track
• insert CLAP plugin on new track
• hit play

I'd expect that both tracks play some notes and generate audio output at this point, but only the master track does.