How to reproduce:
1. Download the user's uploaded project
2. In the project's directory, delete the "Library" and "AssetBundles" folders
3. Execute the following command in the Terminal window:
<path to unity>/Contents/MacOS/Unity -batchmode -nographics -openProject <path to project> -executeMethod ReleaseBuilder.PerformReleaseBuildAssetBundlesCurrentTarget -quit
4. Wait for the batch mode to exit
5. Inspect the Terminal window

Expected result: Asset Bundles are built successfully ant the Editor exits batchmode
Actual result: "Timeout after 300 seconds while waiting async operations to finish. executeMethod 'ReleaseBuilder.PerformReleaseBuildAssetBundlesCurrentTarget" message is logged

Reproducible with: 2020.3.13f1

Note:
- Hard to reproduce, happens only some times when building (repeating for ~5 times)