ID 419924 - Clearing Playback Cache prevents some .mov/QuickTime files from being played

Problem summary

Clearing Playback Cache prevents some .movs from being played 

Customer reported version
hiero.12.0v2

Customer reported platform
windows10

Steps to reproduce

1) Open Nuke Studio

2) Import an attached *_hasBug file

3) Add it to the Timeline and playback the sequence, it plays correctly

4) Clear the Cache using Cache>RAM Cache>Clear Playback Cache

5) Playback the sequence, the clip no longer plays

Attached are some files which work and other which don't. Changing the export type from CBR to VBR sometimes makes a difference, but not always.

Expected behaviour
For the clip to be played back after the cache has been cleared

Actual behaviour
The Playback head doesn't move when pressing play, and the Viewer image doesn't change/sometimes shows black

Reproduced by support

This bug has been reproduced in:

Nuke Studio 12.0v3 - Windows 10 - CentOS 7.7 - MacOSX 10.13

Nuke Studio 11.3v1 - Windows 10

Nuke Studio 11.2v4 - Windows 10 - CentOS 7.7 - MacOSX 10.13 - regressison

Unable to reproduce bug in:

Nuke Studio 11.2v3 - Windows 10 - CentOS 7.7 - MacOSX 10.13

Earliest version tested
Nuke Studio 11.2v3 - This issue doesn't appear in this version and has regressed