Hybrid frame interpolation works only for 2pass encoding

[TVLover10]

• What Hybrid version did you use?(Windows/Mac/Linux 32/64bit + versions number):
  "Windows" Hybrid rev 2019.03.14.1
• What did happen? If an error message came up what did it exactly say?
  No error appears on the screen. After encoding on 1st pass encode (if you selected average bitrate 1pass) it will stop and deleting .stats and .stats.mbtree will just be waiting and waiting.
• What did you do to get to the bug? (best thing is a detailed step-by-step guide so that I can reproduce the problem)
  Selected the 1pass encoding option on x264 for quicker encoding.

Please, read the 'Infos needed to fix&reproduce bugs,..'-sticky before you post about a problem.