a bug when editing in photoshop via lightroom

I believe I have located a bug in Lightroom Classic CC when editing a photo in photoshop and the image is to be transferred back to Lightroom on saving.

If you have images stored on an external drive and edit them in photoshop. Upon saving them, the PSD file is created in the correct location on the external drive.. but Lightroom fails to create a link to the file. Lightroom does attempt to create a linked file within the Lightroom catalogue, but it's the grey 'unable to locate file' place holder image.

The file path to the 'Missing' PSD that is displayed in the panel above the film strip is the correct path and manually locating the file will link the file correctly.

IF you follow the same process with an image stored on the local HDD this process works flawlessly. This is regardless if the catalogue is on the internal or external drive. in my testing, it all depended if the image was on an internal drive or an external drive.

My set up is that I have both the catalogue and images on an external drive that is permanently plugged into my MacBook and have never been able to get this function to operate correctly.

*Oh and Yes I am using save cmd+s rather than save as *