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LV2019 Map IPE Bug

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I want to share a bug that exists in LV2019+ that results in data being overwritten in independent wire branches when changing maps with the Map Get / Replace Value node of the IPE. Here is the code:

797140498_MapIPEBug.png.0beabfd0eecbeded6506c8f7d1d8f2a3.png

This should produce two maps

  • <"key", 0>
  • <"key", 1>

But the actual output is

  • <"key", 1>
  • <"key", 1>

image.png.4c8a58064b0522e428c38a93566a773e.png

As it turns out, Map Get / Replace Value breaks dataflow. There are two workarounds for this issue.

  1. Use the Always Copy function
  2. Wire the Action terminal of the write node

428945750_MapIPEBugFix.png.030fc3edf95004d707de79e647e49d47.png

This was reported to NI with the bug report number #7812505.

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