Pipelines disappeared from Standard Preferences for Piping Component toolbox

Pretty much as the title states.

After opening the dgn file with OBD (CE Update 6) and microstation (CE Update 13) to perform some printing operations, I closed and reopened it with OPM (CE update 7) to find the Pipelines in the dropdown selection area of the combobox in Standard Preferences for Piping Component toolbox were gone. I then checked the pipeline manager as well as the explorer and both reported the pipelines were actually still there. I tried to import the pipelines back to the model, but was told that the pipelines were already existed and nothing was imported. This seems like a bug to me, Is there a way to fix it? Screenshot attached below:

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