Logic "Instrument" Slot missing when loading software instruments

If I create a new Software Instrument track and select a third party instrument like LABS or UA Massive during track creation, the instrument slot on the channel strip does not appear and the instrument doesn't load.

However, if I first load a stock Logic instrument on a Software Instrument track and then replace it with LABS or UA Massive, the plugin loads and works normally.

Has anyone else seen this behavior, or found a fix for third party instruments not initiating during track creation?

I’m running Logic Pro on an Intel Mac. All third party plugins validate correctly in Plug-in Manager, no AU issues, and Rosetta is not applicable.

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