-e: see title, follow-up from case 829765
--works in until 5.5.0a3, tested Win FF & Chrome

-repro:
--get project from case 829765
--build for WebGL
--run build in browser
--click "load" in the scene
--NOTICE error being prompted instead of bundle getting loaded:

uncaught exception: abort(104) at jsStackTrace (550b5_dev.js:859:12)
stackTrace (550b5_dev.js:873:11)
abort (550b5_dev.js:18789:43)
nullFunc_iii (550b5_dev.js:14745:2)
b104 (550b5_dev.asm.js:1730231:1)
ArchiveStorageReader::ReinitCachedBlock(ArchiveStorageReader::CachedBlock, unsigned int) [__ZN20ArchiveStorageReader17ReinitCachedBlockEPNS_11CachedBlockEj] (550b5_dev.asm.js:955478:1)
ArchiveStorageReader::AcquireAndPrefillUnusedBlock(unsigned int, ArchiveStorageReader::CacheResult) [__ZN20ArchiveStorageReader28AcquireAndPrefillUnusedBlockEjPNS_11CacheResultE] (550b5_dev.asm.js:753715:1)
ArchiveStorageReader::ReadBlock(unsigned int, unsigned long long, unsigned long long, void, unsigned long long) [__ZN20ArchiveStorageReader9ReadBlockEjyyPvPy] (550b5_dev.asm.js:942697:1)
ArchiveStorageReader::Read(unsigned long long, unsigned long long, void, unsigned long long) [__ZN20ArchiveStorageReader4ReadEyyPvPy] (550b5_dev.asm.js:855061:1)
ArchiveStorageConverter::DecompressAndStore() [__ZN23ArchiveStorageConverter18DecompressAndStoreEv] (550b5_dev.asm.js:529055:1)
ArchiveStorageConverter::ProcessData(void const, unsigned int) [__ZN23ArchiveStorageConverter11ProcessDataEPKvj] (550b5_dev.asm.js:1474125:1)
AssetBundleLoadFromStreamAsyncOperation::FeedStream(void const, unsigned int) [__ZN39AssetBundleLoadFromStreamAsyncOperation10FeedStreamEPKvj] (550b5_dev.asm.js:1186942:1)
UnityWebStream::FeedDownloadData(unsigned char const, int, bool) [__ZN14UnityWebStream16FeedDownloadDataEPKhib] (550b5_dev.asm.js:1185435:1)
WWW::FeedUnityWebStream(bool) [__ZN3WWW18FeedUnityWebStreamEb] (550b5_dev.asm.js:720121:1)
EmscriptenWWW::OnResponse(void, int, void, unsigned int, char) [__ZN13EmscriptenWWW10OnResponseEPviS0_jPc] (550b5_dev.asm.js:1077353:1)
dynCall_viiiii (550b5_dev.asm.js:1670881:1)
dynCall [Runtime.dynCall] (550b5_dev.js:295:11)
http_onload (550b5_dev.js:13399:5)