P: Develop settings applied to TIFF disappear after editing original

Bonjour Rikk, 

je me permets de demander de l'aide. je ne parle pas anglais. J'utilise Google Traduction. Je suis un vieux photographe français à la retraite.

Dans LR 6 je fais: éditer une copie dans Photoshop. Mais ce matin, LR crée soudainement une copie pour moi avant d'ouvrir le logiciel Photoshop. Ainsi, lorsque je travaille ma copie dans Photoshop, je ne peux plus la sauvegarder. Un message s'affiche indiquant qu'il existe déjà.

Dès que je modifie, j'ai une copie immédiate en LR et une copie immédiate dans le dossier d'origine.
Je fais toutes les possibilités de modification avec. Je recharge complètement LR avec ma licence.
Je peux  faire enregistrer sous le bureau avec Photoshop, pas de problème. Ça marche.
Alors, peut-être que vous avez une idée. J'ai lu tous les tutoriels sur le web.

Merci beaucoup.
Sincèrement, Patrick

Awesome. This was a really annoyance for me

Rikk, the issue appears to be resolved in LrC 9.4 on my Windows 10 system. Thank you!

Updates to Camera Raw, Lightroom Classic, and the Lightroom Ecosystem were released yesterday evening and contain a fix for this issue.  Please install the appropriate update and see if it solves this problem. 

Thank you for your patience.

One side issue I noticed with "edit original' is sometimes the filmstrip/grid thumbnail is not permanently updated.  I can see the photoshop edit when I save in photoshop and return to Lr but if I close Lightroom and restart the thumbnail is the same as the original file before the photoshop edit.  If I go to loupe and zoom 1:1 the thumb will be updated and survive through a restart.  It must be cached somewhere.

When using manual 'Save Metadata to File' the 'Edit in PS' operation strips the XMP CRS metadata from the original file before the PS Save operation. It's creating a new file with no XMP CRS data by over-writing the original file. Automatically Write Changes Into XMP doesn't have this issue so must use a different code path. That's probably the root cause and as you say an "internal code path" nightmare!

I shudder to think about the logic of the internal code paths here 😆

John, you left our a 5th combination using 'Include Develop Settings In Metadata' with 'Save Metadata to File' (CTRL+S). On my system that causes LR to also lose the Develop settings after the 'Edit in PS' > 'Edit Original' PS Save operation. That should update the file's XMP CRS metadata same as Automatically Write Changes Into XMP, but it apparently it doesn't!
I just filed a formal Bug Report for this issue so hopefully it will get attention. I'll add the Bug LID # here once approved.

Lightroom should not have to read any develop settings from the file when you use "Edit Original" for JPG, TIFF etc as Lightroom is pointing to the same file on the disk  (with the photoshop edits) and the catalog still has the Lr edits in History.  Lr just needs to restore these edits like the user does when they select the TOP edit.

Interesting. What may be happening is the following: if you check the option to write develop settings to these files, then some flag is set. When the image returns from Photoshop, Lightroom tries to read the develop settings from the file. However, if you did not actually save metadata to the file (either automatically or manually), then what Lightroom reads is all zeroed. This would explain your fourth line: when you do automatically save metadata to files, the develop settings are indeed saved to the file, and so Lightroom successfully reads them on return of that file.