Bridge does not preserve original file when patch renaming

Nothing has really changed since last year:

batch renaming skips preserving some current file names in metadata

Step 1 – Preserve:

Step 2 – Verify all files have the preserve metadata included:

PS: You can of course also search for the absence of the preserved metadata.

Step 3 – Batch rename (once you have verified that the original filenames have been preserved)

Optional Step – If required, restore the preserved filename:

Bridge has its forum, so I'll move your question there for better attention.