ID 147368 - nuke.sample() starts returning 0.0 when it samples expression linked values

Problem summary
nuke.sample() starts returning 0.0 when it samples expression linked values

Customer reported version
n/a

Customer reported platform

Steps to reproduce

1) In Nuke, load the attached script.

2) Run the following script:

input_node = nuke.toNode('Roto2')

print input_node.sample('rgba.alpha', 1245, 600, 1.0, 1.0, 81)

3) Run the next snippet and observe the output:

print input_node.sample('rgba.alpha', 1245, 600, 1.0, 1.0, 82)

Expected behavior
The result should show 1.0.

Actual behavior
The result becomes 0.0 when running the snippet a second time.

Workaround
Clearing the cache allows the value to show 1.0 again when ran subsequent times. Using nukescripts.cache_clear()​between the instances updates as expected.

Reproduced by Support in

Nuke 12.2v1 - Windows 10

Nuke 12.0v1 - Windows 10

Nuke 11.0v1 - Windows 10

Nuke 10.0v1 - Windows 10

Nuke 9.0v1 - Windows 10

Nuke 8.0v1 - Windows 10

Unable to reproduce bug in:
Nuke 8.0v1 - Windows 10

Earliest version tested
Nuke 8.0v1 - Always existed.