Failed update from 1.90-bugfix2 to 1.601

[Makeitmorebetter]

Failed update from 1.90-bugfix2 to 1.601. Navigating to http://homeassistant:80 results in and nginx 502 Bad Gateway page.
My system information:

System: Home Assistant OS 16.3 (aarch64 / raspberrypi5-64)
Home Assistant Core: 2025.12.4
Home Assistant Supervisor: 2025.12.3

The Organizr add-on log shows the following:

parse error: Expected string key before ':' at line 1, column 4
[20:24:18] ERROR: Unknown HTTP error occured
 Add-on: 
 
-----------------------------------------------------------
 Add-on version: 
 You are running the latest version of this add-on.
parse error: Expected string key before ':' at line 1, column 4
[20:24:19] ERROR: Unknown HTTP error occured
 System: 
 Architecture:  / 
 Home Assistant Core: 
 Home Assistant Supervisor: 
-----------------------------------------------------------
 Please, share the above information when looking for help
 or support in, e.g., GitHub, forums
-----------------------------------------------------------
 Provided by: https://github.com/alexbelgium/hassio-addons 
-----------------------------------------------------------
parse error: Expected string key before ':' at line 1, column 4
[20:24:19] ERROR: Unknown HTTP error occurred

Eventually it just continuously shows:

No cron file to run...
[27-Dec-2025 12:25:01] ERROR: [pool www] please specify user and group other than root
[27-Dec-2025 12:25:01] ERROR: FPM initialization failed
[27-Dec-2025 12:25:02] ERROR: [pool www] please specify user and group other than root
[27-Dec-2025 12:25:02] ERROR: FPM initialization failed

[github-actions]

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