External editing preset for Photoshop creates TIFF file with .jpg extension

I believe I have found a bug in Lightroom Classic. I am posting here in Discussions to confirm.

Lightroom Classic Version Number: 14.3.1

OS Version Number: Windows 11, Version 10.0.26100 Build 26100

I have configured my Lightroom Preferences: External Editing settings to have a preset called "Photoshop - JPEG", where the application is set to Photoshop.exe and the File Format is set to JPEG. When I select a photo and choose Photo: Edit In: Photoshop - JPEG from the main menu, I get the usual dialog box to choose whether to edit a copy or the original. In this dialog I can see that the File Format is correctly set to JPEG. However, when I click the Edit button in this dialog, Photoshop starts and immediately displays the message "Photoshop could not complete your request because of a program error." When I look in the folder where my photo is stored, I can see the copy that Lightroom has created, and the file extension of this copy is correctly set to .jpg. However, I can see that the copy is much larger than it should be, and when I open this file in IrfanView, it tells me that the file is actually a TIFF file with a .jpg extension. This explains the error message from Photoshop.

This problem only occurs when the application is set to Photoshop. I created another external editing preset called "Krita - JPEG", where the application is set to Krita.exe. The two presets are otherwise identical. When I use the Krita preset, the copy of the photo created by Lightroom is an actual JPEG file - it has a .jpg extension, it is the correct size, and both IrfanView and Krita have no trouble loading it.

This problem only occurs on Windows. I have the same external editing presets configured on my Mac, and both of them work fine there.