Your system information

• Steam client version (build number or date): 1785799196
• Distribution (e.g. Ubuntu): NixOS
• Opted into Steam client beta?: No
• Have you checked for system updates?: No
• Steam Logs: NA
• NA

Please describe your issue in as much detail as possible:

$ l /old-root/$HOME/.local/share/Steam/steamapps/common/Factorio/bin/x64/factorio
-rwxr-xr-x 1 daniel users 233M Jun 23 19:25 factorio

$ l $HOME/.local/share/Steam/steamapps/common/Factorio/bin/x64/factorio
-rw-r--r-- 1 daniel users 233M Jun 23 19:25 factorio

causes this: (obviously)

v-adverb[688268]: E: Failed to execute child process ?$HOME/.local/share/Steam/steamapps/common/Factorio/bin/x64/factorio? (Permission denied)

Validation does not fix the issue.