ID 473443 - Timeline disk cache is removed/deleted when versioning up/down while the burn-in soft effect knobs are set to none.

Problem summary

Timeline disk cache is removed/deleted when versioning up/down while the burn-in soft effect knobs are set to none.

Customer reported version
nuke.12.2v3

Customer reported platform
windows10

Steps to reproduce

1) In Nuke Studio, import at least 2 clips to the Project bin with two or more versions available. 

2) Drag+drop the clips to the Timeline to create a Sequence.

3) Add a Burn-in soft effect to each clip.

4) Adjust the Properties for the Burn-in soft effects to set some knobs to 'none'.

5) Select Cache Sequence Range on the Timeline and let it complete.

6) Version-up/down a clip on the Timeline, observing the orange cache bar.

Expected behavior
The Timeline Disk Cache should remain available or swap back to being present when versioning.

Actual behavior
The Timeline Disk Cache is either deleted or removed from multiple clips when the burn-in soft effect has knob set to none.

Workaround
Having all of the burn-in knobs set to a parameter other than 'none' seems to keep the Timeline Disk Cache when versioning.

Reproduced by Support in:

Nuke Studio 13.0v1 - Windows 10, CentOS 7

Nuke Studio 12.2v1 - Windows 10

Nuke Studio 12.1v1 - Windows 10

Nuke Studio 12.0v1 - Windows 10

Nuke Studio 11.3v6 - Windows 10

Nuke Studio 11.3v2 - Windows 10, CentOS 7

Unable to reproduce bug in:
Nuke Studio 11.3v1 - Windows 10, CentOS 7

Earliest version tested
Nuke Studio 11.3v1- This issue doesn't appear in this version and has regressed