Firmware v3.9 fails L-band receive with custom hardware

[edgecase14]

Subject of the issue

The usb serial or BT console spews

zedEnableLBandCorrections: Unknown platform zedEnableLBandCorrections: Unknown platform zedEnableLBandCorrections: Unknown platform

continuously, and endlessly, and an RTK Float or Fix isn't obtained after 5 to 10 minutes.

Your workbench

This is a bare ESP32 Thing Plus C connected to ZED-F9P/NEO-D9S combo breakout.

Steps to reproduce

After reset to firmware defaults, and configure WiFI and custom Thingstream token, and provision keys. Firmware v3.8 works as expected, with valid L-band keys, an RTK fix is obtained.
Then upgrade to v3.9, and once keys are available, which since we are using a custom Thingstream profile, requires to Disable then Enable PointPerfect due to a pending issue, the spewing begins.

Expected behavior

RTK Fix should happen after 2 minutes.

Actual behavior

RTK fix never obtained, and endless console messages.