ID 461944 - Nuke crashes with Static frame set when changing the Read node image sequence to a container file via Python.

Problem summary
Nuke crashes with Static frame set when changing the Read node image sequence to a container file via Python.

Customer reported version
nuke.12.2v3

Customer reported platform
windows10

Steps to reproduce

1) In Nuke, open the Preferences... (Shift+S) and navigate to Node Graph.

2) Change the postage stamp mode to Static frame and click Ok.

3) Read in footage with multiple frames, such as .dpx or .exr.

4) Open the Script Editor and copy/paste the following snippet:

n = nuke.selectedNode()
n["file"].setValue("path/to/file.mov")

5) Select the Read node in the Node Graph, then run the Python command (after substituting the file path to a video type).

Expected behavior
The file name should be replaced and Nuke remain stable.

Actual behavior
Nuke crashes when running the Python command to change the frame footage to a video type such as .mp4 or .mov.

Workaround
Having the Preferences... > Node Graph > postage stamp mode set to Current frame does not have issue occur.

Reproduced by Support in:

Nuke 12.2v3 - Windows 10, macOS 10.13.6

Nuke 12.2v2 - Windows 10
Nuke 12.2v1 - Windows 10, macOS 10.13.6

Unable to reproduce bug in:
Nuke 12.1v5 - Windows 10, macOS 10.13.6

Earliest version tested
Nuke 12.1v5 - This issue doesn't appear in this version and has regressed