Reproduction steps:
1. Download and open the attached project: "doles-dolez.zip"
2. Go to Edit > Project Settings... > Player > Publishing settings
3. Make sure "Use R8" and "Release" checkboxes under Minify are selected
4. Go to Build Settings and check the Build App Bundle (Google Play) checkbox
5. Build the app bundle
6. Open the Google Play Console and upload the app bundle
7. Under "Required features" press the options button to upload the ReTrace mapping file created in the same folder as the built app bundle
8. Upload the mapping file

Expected result: The mapping file is accepted
Actual result: The mapping file is not accepted, an error is thrown - "Couldn't upload. Try again."

Reproducible with: 2020.3.27f1, 2021.2.9f1, 2022.1.0b5, 2022.2.0a2
Could not test with: 2019.4.35f1 (Due to errors upon downgrading the project)

Notes:
- The naming of the mapping file was the same for both minification versions, thus ruling out file naming as the issue
- The R8 minification mapping file is noticeably smaller and contains fewer lines than the Proguard minification mapping file
- When uploading the app bundle generated with Proguard minification, the ReTrace file is uploaded by default
- In a message below, the user attached screenshots related to the steps for clarification
- The mapping files are attached down below for comparison: "test_mapping_R8.txt", "test_mapping.txt"