Pro Tools won't record MIDI from Plugin

[Heggi]

Hello everyone!

I searched the web for this one but no luck, so now I'm hoping to get some help from someone here. This is my situation:

After a clean install of macOS Mojave and Pro Tools 21.6 I am unable to record MIDI events from a plugin to a MIDI/Instrument track.

My process:
Create an Audio track. Insert a clip. Insert a plugin that creates MIDI events.
Create a MIDI/Instrument track. Set Input to the Plugin Output.
Arm track, start recording.

I can see the meters moving. I can "patch through" the MIDI events to another track with an Instrument plugin and it will play something. However I am unable to record the MIDI events.

I checked the MIDI Through option and unchecked MIDI input filtering.

I know this has worked in the past as I used it before, so what am I missing?

Thanks everyone!

*edit*
Thought my system info would show up here, so here it is:
Mac Mini late 2018
macOS Mojave 10.14.6
Pro Tools 2021.6
Motu M2