Problem is now present in the latest Stable Steam client for Linux build Apr 16 2019, 21:10:43
It seems like nvidiav1 cache is now stored properly. Only one issue still remains: DXVK cache.
Steam for Linux Beta May 18 2019, 00:44:39
All problems fixed (at least for me) in Steam for Linux build Jun 14 2019, 20:52:24, Ubuntu 19.04
Thanks for following up, closing per the last comment.
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Please describe your issue in as much detail as possible:
For some reasons Proton started to storing cache not in the game related cache folder. For example: Risk of Rain 2 cache folder is
steamapps/shadercache/632360/DXVK_state_cache, but when you launch the game, cache stored insteamapps/shadercache/0/DXVK_state_cache. Also same issue you can observe withnvidiav1cache folder.Steps for reproducing this issue: