Your system information

• Steam client version (build number or date): 8 Jun (beta for now)
• Distribution (e.g. Ubuntu): Manjaro (testing)
• Opted into Steam client beta?: [Yes] 8 Jun update didn't change anything
• Have you checked for system updates?: [Yes]

Please describe your issue in as much detail as possible:

I'm using Steam without Steam Runtime for years. An update released on 7 Jun stopped Steam from running.
Before that update, Steam was working fine, and i didn't change anything to my OS at the time of update.
Anyway, Steam is working fine with steam runtime.

First, there's an error in terminal:
Steam: An X Error occurred X Error of failed request: BadAtom (invalid Atom parameter) Major opcode of failed request: 20 (X_GetProperty) Atom id in failed request: 0x0 Serial number of failed request: 12 xerror_handler: X failed, continuing

Then there's a bunch of errors:
src/clientdll/appdatacache.cpp (2679) : Assertion Failed: !bSharedKVSymbols

And Steam is stuck on "Connecting Steam account" monit.

I tried to debug Steam through DEBUGGER=gdb steam, and here's the Gist with GDB log: https://gist.github.com/StarterX4/0187d369961189ea8a0d98620bb2a932

I also debugged Steam with STEAM_RUNTIME=1 (the first error is also there, but at least Steam runs fine): https://gist.github.com/StarterX4/4312d91a3d9af9ca7c34382d4a44812d

Steps for reproducing this issue:

1. STEAM_RUNTIME=0 steam