How to reproduce:
1. Open user-submitted project (ANIMATOR_CURRENT_INTERRUPT)
2. Select the 'xbot' GameObject in the Hierarchy window
3. In the Animator window select 'Layer 1' and click on the 'Parameters' tab
4. Enter Play Mode
5. Click the 'clip_trigger' parameter - animation transition between 'Null 0' and 'Clip' is smooth
6. Pause the Play Mode and click 'clip_trigger' again
7. Skip a couple of frames until the transition between 'Null 0' and 'Clip' is visible
8. Click the 'null_trigger' parameter and unpause Play Mode
9. Cick 'clip_trigger' once again

Expected result: the transition between 'Null 1' and 'Clip' is smooth
Actual result: all the subsequent transitions between 'Null 0' and 'Null 1' to 'Clip' are cut short

Reproducible with: 2017.4.19f1, 2018.3.3f1, 2019.1.0b1, 2019.2.0a2