External Diff/Merge with custom tool fails due to relative filenames

SourceTree 4.1.5 (241)

MacOS 12,2

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Steps:

• setup some custom Diff/Merge tool
• try to either diff against changed file in working tree or resolve conflicts

Expected:

• it works

Actual:

• it doesn't due to bad filenames
• to my view filename of what is in working tree seems relative to the repo

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Actually I tried to link SourceTree with Meld as I did couple years ago - that time they work together very good

I used a way:

• Diff command: `open`
• Arguments: ` -W -a Meld --args "$LOCAL" "$REMOTE"`

Using `ps` I captured

I just captured `ps`  command line

When it diffs some history revisions it puts full paths to the temporary files.

However when it diffs some file in the working copy it uses path relative to the working copy root.

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Maybe I mad something wrong while setting up Diif/Merge commands?