APNG format is somewhat rare variant of animated PNG format and the support for it is somewhat low, but it can be still exported to standard graphics formats. The only drawback of apng to tiff conversion or any other export to standard raster format would be that the resulting file will no longer be 'animated' and just one frame will be saved in each picture. So from a single .apng file you will get several .tiff files for example.
Updated: March 14, 2023