Pillow 9.3.0 webp EXIF changes leads to crash

[bigcat88]

In version 9.3.0 Pillow allows to save EXIF for WEBP format without firsts 6 bytes b'Exif\x00\x00'
python-pillow/Pillow#6582

This code

pillow_heif/pillow_heif/private.py

Line 162 in 0430fcb

if not _result and md_block["data"] and md_block["data"][0:4] == b"Exif":

cannot read them.
And this throws and exception during parsing EXIF:

pillow_heif/pillow_heif/misc.py

Line 37 in 0430fcb

tif_tag = info["exif"][6:]