Avoid Lightroom develop adjustment on images back from Photoshop

@bruno_4933 

When the file is open in Photoshop, go to File > File Info and look at the raw data tab for crs: metadata. These entries are the camera raw settings used by Lr or ACR.

A Photoshop script can remove this metadata. Test with care on a duped or non-critical file, I don't use Lr so I don't know if this will help or not:

// Remove Camera Raw Settings CRS Metadata from Open Doc.jsx

#target photoshop

removeCRS();

function removeCRS() {
    if (!documents.length) return;
    if (ExternalObject.AdobeXMPScript == undefined) ExternalObject.AdobeXMPScript = new ExternalObject("lib:AdobeXMPScript");
    var xmp = new XMPMeta(activeDocument.xmpMetadata.rawData);
    XMPUtils.removeProperties(xmp,XMPConst.NS_CAMERA_RAW, "", XMPConst.REMOVE_ALL_PROPERTIES);
    app.activeDocument.xmpMetadata.rawData = xmp.serialize();
} 

https://prepression.blogspot.com/2017/11/downloading-and-installing-adobe-scripts.html

A mystery to me, and I don't have an answer. I cannot emulate the same in my system.

Can I clarify some of your statements-

"export to photoshop" -  DO you mean EXPORT, or are you using the [Edit In] command [Ctrl+E]?

"save as TIFF" - Do you simply [Save] and [Close] in Ps, or are you doing a [Save AS]?

Are you Importing the new TIF to LrC (either by normal import or synchronize folder)?

I note your screen-clip shows two images in "Previous Import" which is a little odd! It suggests you have (freshly) Imported the raw and the TIF also.

Do you have that preset named in the Develop Settings in the [Apply During Import]  panel?

So I don't have the answer! You can however, until you get a corrent answer,   do a [Right-Click] on the "Edited in Photoshop" history step and then [Clear History above this step].

Do you mean the Develop Preset seems to be applied twice to the TIF? (Once in LrC and again when it returns from Ps.)

And after the TIF is 'Saved' from Ps, does the TIF in LrC show any develop steps in the History panel?  I see this in History-

And my TIF from Ps also shows the 'Photo Has Development Adjustments' badge-  which is apparently normal.

If you edit in LrC and apply a preset then [Edit in Ps], then indeed that develop preset is incorporated into the TIF that you are editing in Ps. (In the same way that a raw image edited in ACR and opened in Ps would show the ACR edits.)