"Primary script unknown" after updating NGINX/php-fpm configuration

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Within the nextcloud container’s logs I see, starting from when I turned on the new nginx configuration, to now:

docker[1288]: 172.17.0.1 -  26/Nov/2019:04:45:02 +0000 "- " 200
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:45:02 +0000 "- " 200
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:49:01 +0000 "- " 200
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:49:01 +0000 "- " 200
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:49:09 +0000 "- " 200
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:49:14 +0000 "- " 200
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:49:31 +0000 "- " 200
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:51:49 +0000 "- " 200
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:51:51 +0000 "- " 200
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:57:50 +0000 "GET /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:57:52 +0000 "GET /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:04:58:54 +0000 "GET /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:05:01:31 +0000 "GET /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:05:03:31 +0000 "GET /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:05:08:10 +0000 "GET /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:05:13:54 +0000 "GET /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:05:14:07 +0000 "POST /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:05:18:32 +0000 "GET /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:05:24:01 +0000 "GET /index.php" 404
docker[1288]: 172.17.0.1 -  26/Nov/2019:05:27:25 +0000 "GET /index.php" 404
systemd[1]: Stopping Nextcloud...
docker[1288]: [26-Nov-2019 05:29:21] NOTICE: Terminating ...
docker[1288]: [26-Nov-2019 05:29:21] NOTICE: exiting, bye-bye!
docker[26337]: nextcloud
systemd[1]: Stopped Nextcloud.
systemd[1]: Started Nextcloud.
...
docker[18534]: 172.17.0.1 -  26/Nov/2019:13:18:31 +0000 "GET /index.php" 404
docker[18534]: 172.17.0.1 -  26/Nov/2019:13:18:34 +0000 "GET /index.php" 404
docker[18534]: 172.17.0.1 -  26/Nov/2019:13:19:06 +0000 "GET /index.php" 404
docker[18534]: 172.17.0.1 -  26/Nov/2019:13:19:40 +0000 "GET /index.php" 404
docker[18534]: 172.17.0.1 -  26/Nov/2019:13:23:32 +0000 "GET /index.php" 404
docker[18534]: 172.17.0.1 -  26/Nov/2019:13:23:34 +0000 "GET /index.php" 404