You could deep profile that, or, possibly the better solution, turn on Call Stacks (in the window toolbar) to record call-stacks on these GCAlloc samples (see link for how to use this feature) to figure out what is allocation these 22MB. If it’s your codes this should give you some pointers of what to optimize if you want to improve performance in the editor
As I said, that looks like a C# event invocation. I can’t tell much more from that screenshot. Maybe there is more to that call stack or maybe Deep Profiling can show more here?