P: Develop settings applied to TIFF disappear after editing original

Consolidating information from the multiple threads and doing more testing shows there are three workarounds, strongly suggesting this inconsistent behavior is a bug, not intended by the original product design:

1. When PS returns to LR, click on the edit showing at the top of the History panel. (The existing edits are shown in History.)

2. Check the option Catalog Settings > Automatically Write Changes Into XMP.

3. Uncheck the option Catalog Settings > Include Develop Settings In Metadata.

I tested all four combinations of those Catalog Settings:

Instead of  unchecking 'Include Develop settings in metadata inside JPEG, TIFF, PNG, and PSD files' which you may want to keep checked you can click the TOP edit in the History panel when you return from Photoshop and the Lightroom edits will be restored.  Your edits are not LOST.   I agree this is a bug.

With prior versions of Lightroom, going back many years, I was able to open a PSD file using "Edit Original" and upon returning to Lightroom after editing and saving the file, the Lightroom edits (i.e. crop) were retained.  This functionality has been lost in the current version.  It is very important to me to be able to edit the original, uncropped PSD file while maintaining the crop after returning to Lightroom. Now, all LR adjustments are reset upon return from Photoshop.  By the way, if the PSD file that was opened from LR "Edit Original" into Photoshop is not saved from Photoshop, the Lightroom edits are maintained.

Confirmed. I wondered why I couldn't replicate the problem, but that's because I never check that option.

After doing some more research on this issue I discovered one of my post from 2016 with a solution! If you uncheck 'Include Develop settings in metadata inside JPEG, TIFF, PNG, and PSD files' in Catalog Settings the LR settings will be retained when using 'Edit in PS' > 'Edit Original.'  At least that's the case on my Windows 10 system with LR 8.3.1. I must have changed that setting recently for some reason and forgot the consequences.

https://forums.adobe.com/message/8487967#8487967

However, It's still a bug because you should be able to use this setting with 'Edit in PS' without losing the LR settings. See these two posts for more details:

https://forums.adobe.com/message/8488318#8488318

https://feedback.photoshop.com/photoshop_family/topics/lr-cc2015-4-v6-1-lightroom-edits-not-being-re...

Sometimes I make adjustments in the Lightroom Develop module on top of TIF files that I have created in Photoshop.  I may go back and do further editing in Photoshop.

As of 8.3.1 (perhaps earlier), when I edit in Photoshop ("Edit Original" in the edit pop up in Lightroom), after I save the file, all develop changes in Lightroom are lost.

It happens with Lightroom exported JPG and TIFF files also so it is not limited to scanned files.

This also happens with a LR 'Edit in PS' 16 bit/channel TIFF so not unique to a SIlverFast created TIFF. I've marked this as 'Acknowledged.'

You are not alone: https://forums.adobe.com/thread/2635624

2 years later and bug is still there. Steps to reproduce:
1. Open 48 bit TIFF in Lightroom and apply various adjustment
2. From Lightroom app choose 'Edit original in photoshop"
3. Do simple adjustment and save in pohotoshop (no resize / resample)
4. Go back to LR

Result:
Applied effects from step 1 are not visible.  They exists in history pane. But after reapplying them through history, crop and spot removal are shifted on x/y axis. Need readjustment.

Other possible explanations. Photoshop modifies some metadata when saving TIFF. TIFF file was create by Silverfast.