Not entirely true, everything lower than minimum allowed version won’t start anymore.
Had this happen last month. For example during startup:
2024-04-15T17:44:47+02:00 WARN version version not allowed/outdated {"current version": "1.97.3", "minimum allowed version": "v1.99.3"}
2024-04-15T17:44:47+02:00 ERROR failure during run {"error": "Failed to check version: software outdated: outdated software version (v1.97.3), please update [...]"
2024-04-15T17:44:47+02:00 FATAL Unrecoverable error {"error": "Failed to check version: software outdated: outdated software version (v1.97.3), please update [...]"
Even worse, can crash anytime while running
2024-01-03T09:56:11+01:00 WARN version version not allowed/outdated {"current version": "1.92.1", "minimum allowed version": "v1.93.2"}
2024-01-03T09:56:11+01:00 ERROR services unexpected shutdown of a runner {"name": "version", "error": "outdated software version (v1.92.1), please update"}
2024-01-03T09:56:11+01:00 FATAL Unrecoverable error {"error": "outdated software version (v1.92.1), please update"}