What is this>>>>

1st is render image
2nd is save image after render with transparent bg
where is candle flams ???
bug or something else??

Check with the image editing program.
The image viewer program does not express transparent areas.

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You may have alook here:

…about the porblems with alpha channels and the “coding” of it…

Using also the top right :mag: search feature :wink: …you can find aaaaa llloootttttt postings about this…

https://blenderartists.org/search?q=alpha%20channel%20order%3Alatest