How to reproduce:
1. Open attached project "Input_Bug_Stripped.zip" and scene "SampleScene"
2. Enter Play mode
3. Click and release once and fast
4. Observe Console window

Expected result: no errors are thrown
Actual result: 3 errors are thrown

Reproducible with: 2019.4.0f1, 2020.1.0b12, 2020.2.0a14 (1.0.0-prev.5, 1.0.0)
Not reproducible with: 2019.4.0f1, 2020.1.0b12, 2020.2.0a14 (1.0.0-prev.3, 1.0.0-prev.4)
Could not test with: 2018.4 (package was not yet released)

Thrown errors:
Map index on trigger does not correspond to map index of trigger state
Exception 'IndexOutOfRangeException' thrown from state change monitor 'InputActionState' on 'Button:/Mouse/leftButton'
IndexOutOfRangeException: Index was outside the bounds of the array.