GPS information not read for all images

I think AR is great and recently I've been using it to rename photos using their geotag information. In fact, it's why I licensed my copy. But I've noticed the method seems to fail for what appears to be older photos, even though they have geotag information embedded in them. I have a rule that renames photos like this:

<GPS City> <GPS Lat> <GPS Lng> <Img Year><Img Month><Img Day>_<Img Hour><Img Min><Img Sec>

This works for most, but not all, JPGs. A typical result will be:

Oakville 43.4595 -79.7848 20200916_154645.jpg

The filename keeps its date and time information, and prefixes the geographic and lat-long information. But it doesn't always seem to work. Some older photos (this one from 2009) end up named things like:

0.0000 0.0000 20090418_121744 0401.jpg

This is in spite of the photo having the following in EXIF:

GPS
Altitude Ref Sea Level
Altitude 170.0000
Longitude Ref West
Longitude 79° 47' 14.20"
Latitude Ref North
Latitude 43° 27' 25.40"

However, newer photos that successfully get renamed (like the one mentioned in the first instance) have something like the following EXIF:

GPS
Latitude Ref North
Latitude 43° 27' 34.14"
Longitude Ref West
Longitude 79° 47' 5.10"
Altitude Ref Sea Level
Altitude 128.1000
TimeStamp 19 46 45
Processing Method ASCII
Date Stamp 2020:09:16

I don't understand why AR is picking up info from what appears to be exactly the same tags in the latter instance, but not the former. Is there anything that can be done to rectify this?

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