Batching TIF to PNG - metadata lost

For many years now (since the days of PS7) I have used some carefully crafted actions to prepare entire directories of up to 1,000 images for publishing to the Internet. Or it may be that I am running a series of tonal adjusting commands and saving the images into another directory as "enhanced" images.
Here is my problem. I have metadata templates for each record set that I apply to a record set. I then enter new keywords for each image in the set. Afterwards I would create my enhanced set of images. No harm, no foul for the exception of two fields becoming truncated after the file is saved. And that is easy enough to repair be selecting the record set of images and making the minor repair.
Here lies the problem. After processing to achieve the enhanced set of images I run another set of actions resulting in a smaller dimensional file with a drop shadow suitable for uploading to an Interent Content Managament System. No problem. Except that the metadata information has been stripped. At present I have to reapply the metadata template and then copy each set of keywords from the original files into the PNG files. This is very time consuming and can take up to 8 or more hours to copy the keywords over.
And yes, I despise Fireworks (it should be called some four letter words) and it bloats the files' size by up to 10% per image. When you are talking about 1,000 plus images per batch 10% per image file size bloat starts adding up! I see no way in Firepuke to run a batch, unless that is the Script command and even then I am not a programmer and don't have the time to teach myself programming.
Furtermore, I don't want to have to create a set of actions for Photoshop and then open another program (Firepuke) to run a series of actions to prepare the same file for the Internet.
Any thoughts, and especially any help, would be deeply appreciated
A. Wayne Webb

Info: Mac, Yosemite, Bridge CC
I have an extensive collection of PNG files that HAD been keyworded in Bridge (XMP). I noticed several days ago that the XMP of all those files is now missing.
When attempting to assign keywords back in, I also get the message: "The file ####.png canot store XMP metadata. No changes will occur." Weird. Like you said, it's looking like a bug.
And here's the kicker... if I duplicate the PNG file (Edit > Duplicate), the "copy" DOES contain the original XMP that went missing.
I really don't want to have to manually duplicate all my PNG files just to regain the metadata. Any brainy solution? I'm attaching an example of the original PNG (missing XMP) and the duplicated PNG (magically restored XMP).

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ADOBE SYSTEMS INCORPORATED
Copyright 2005 Adobe Systems Incorporated
All Rights Reserved
NOTICE: Adobe permits you to use, modify, and
distribute this file in accordance with the terms
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If you have received this file from a source
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Batching TIF to PNG - metadata lost

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