Postgres legacy cluster read replica remaining unhealthy after image update

I updated to flyio/postgres:14.4 v0.0.33, but one of the same-region read replicas (8190895c) is remaining unhealthy, failing checks. Restarting its VM hasn’t helped.

ID  	SERVICE	STATE   	OUTPUT                                                                                                                                        
vm  	app    	passing 	HTTP GET http://172.19.3.114:5500/flycheck/vm: 200 OK Output: [✓] checkDisk: 8.92 GB (91.3%) free space on /data/ (52.7µs)                   	
    	       	        	[✓] checkLoad: load averages: 0.00 0.00 0.00 (69.51µs)                                                                                       	
    	       	        	[✓] memory: system spent 0s of the last 60s waiting on memory (51.39µs)                                                                      	
    	       	        	[✓] cpu: system spent 486ms of the last 60s waiting on cpu (16.88µs)                                                                         	
    	       	        	[✓] io: system spent 210ms of the last 60s waiting on io (14.83µs)                                                                           	
pg  	app    	critical	HTTP GET http://172.19.3.114:5500/flycheck/pg: 500 Internal Server Error Output: failed to connect with local node: context deadline exceeded	
role	app    	critical	failed to connect to local node: context deadline exceeded