0.94.1 - Saving HEIC files - black lines in saved picture (graphic error)

[masterjp]

I use the heic extension from Microsoft Store and saved some files to heic format.
After the conversion I recognized, that XnViewMP saved a few of the pictures with black lines. (Example file attached).

I am not sure, if it is a problem of XnViewMP or the heic extension from Microsoft store.

First I though the program has a problem with the big picture size (longest side >2.000 pixels).
Then I tested it again and saw, that only big files with a odd wide or length have the black lines.
I resized the picture again to a small size (800x599 pixels) and everything is fine.

Very strange!

[xnview]

always at the bottom? do you have tried Paint.net, i think that it use same plugin?

[masterjp]

If one side has an odd pixel size, only one side has black lines. If both sides have an odd pixel size, both sides have black lines.
I tested the same problem with Paint.net and I got the same problems with black lines.
The bug is in the HEIC extension. In Microsoft Store I did not find a way to contact Microsoft. It is very complicated to contact them, because they show you a FAQ without useless informations.