None standard external port causes apache error

I am using nextcloud AIO docker with port 15443 as external port instead of 443. I adjusted OVERWRITEHOST and trusted domains accordingly and so far everything is fine. But I do get sporadic error messages from the apache docker container. It seems like the apache docker container tries to access the local IP via port 15443 which of cause would be wrong.

[Sun Apr 21 10:11:03 2024] [error] [(70008)Partial results are valid but processing is incomplete] [client:,] [AH01075: Error dispatching request to :15443: (reading input brigade)] [Mozilla/5.0 (iOS) Nextcloud-iOS/5.2.7]

Is there any way to adjust this?

Hi, see GitHub - nextcloud/all-in-one: 📦 The official Nextcloud installation method. Provides easy deployment and maintenance with most features included in this one Nextcloud instance.

Thats a bummer, I would really like to change the port since attacks on my route spike when I open 443.