ID 501901 - File specific options are missing when using all capital letters (uppercase) for extension names (.ABC/.FBX) in the Camera3, Axis3, and Light3 nodes.

Problem summary
File specific options are missing when using all capital letters (uppercase) for extension names (.ABC/.FBX) in the Camera3, Axis3, and Light3 nodes.

Customer reported version
nuke.13.1v1

Customer reported platform
centos7

Steps to reproduce
1) In Nuke, add a Camera, Light, or Axis node.
2) Enable the read from file knob, then open the file browser and choose a file with an uppercase extension (.ABC/.FBX)
3) View the File tab for any properties.
4) Add another Camera node, then add a lowercase extension .fbx or .abc file, and view the File tab knobs.

Expected behavior
The FBX file extension should allow all data to be read on the Camera3/Axis3/Light3 nodes.

Actual behavior
The ABC/FBX Options fail to appear, causing issues with the Camera/Axis/Light node missing information.

Workaround
Ensure the Axis/Camera/Light file extension uses all lowercase letters. Additionally, using the Camera2 node does not exhibit this issue.

Reproduced by Support in:
Nuke 13.1v2 - Windows 10, macOS 10.15
Nuke 13.1v1 - Windows 10
Nuke 13.0v1 - Windows 10, macOS 10.15

Unable to reproduce bug in:
Nuke 12.2v10 - Windows 10, macOS 10.15

Earliest version tested
Nuke 12.2v10 - This feature did not exist before this version (Camera3/Axis3/Light3 nodes)