Error when reading pack.mcmeta of data or resource packs shows default string representation

The bug

The error message created when the pack.mcmeta file of a data or resource pack cannot be read uses the default string representation instead of the file path.

[Client thread/WARN]: Couldn't find pack meta for rn@393b9e88

How to reproduce

1. Download the attached resource pack MC-123459 resource pack.zip
2. Place the resource pack in the resourcepacks folder of your profile
3. Open the resource pack selection in Minecraft
   → The error logged uses the default string representation