Presets for Fabfilter ProQ3 plug-in not acting properly with sidechain

[Sanzy]

Steps:
- Create track
- Add equalizer to track 2 (insert) Fabfilter ProQ3.
- Open plug-in pin connector
- Press I/O
- Request VST3 bus channel count
- Click stereo
- Close "plug-in pin connector" window
- Press plus
- Save preset as default

later on...

- Create 2 tracks.
- Routing sidechain track 1 into track 2 (audio channel: 3/4, 5/6 maybe others work as well)
- Add equalizer to track 2 (insert) Fabfilter ProQ3.
- Open plug-in pin connector
- Press I/O
- Request VST3 bus channel count
- (Bug here) Stereo appears to be checked but you have to click it so it really is selected.

Not sure if it is your bug or ProQ3 bug

ProQ3 takes channels 3/4 not as side chain but as channels for surround system. But if we want to use those as side chain then we have to force stereo in VST3 version of plugin so those channels are used as side chain. If side chain is added before ProQ3 then the preset for stereo doesn't work properly. On the other hand if ProQ3 is already present on a track then the preset works properly.

The main problem with the plugin is that the channels 3/4 placed on the track trigger dynamic equalization points intended for channel 1/2. for this, it is necessary to include forced stereo, so that channels 3/4 would not be perceived as surround channels. But while saving the preset, such an annoying bug comes out.

My config:
- Xeon x3480
- DDR3 1600 32 gb
- Windows 10 ver. 1809
- Reaper ver. 5.980
- Fabfilter Pro Q3 ver. 3.10

[multibody]

Same problem here. Since I only work in stereo it is very annoying to request the vst3-channel count for each Pro-Q3 instance.