matrix-hookshot: [BUG] Webhook does not seem to be generated correctly

Describe the bug When installing Matrix via Ansible in Docker via https://github.com/spantaleev/matrix-docker-ansible-deploy/blob/master/docs/prerequisites.md and adding a Webhook to a Room the Webhook does not seem to be generated correctly and results in a 404 Error when being used (replaced URl Data etc with Dummies for this Post)

2022-05-17 12:38:05,122 - synapse.http.client - 726 - WARNING - GET-1855 - Got 404 when downloading https://matrix.domain.tld/hookshot/webhooks/647417c9-70e7-4283-a86a-42a5ba447ab5%3C/code%3E

May 17 12:38:06 matrixserver matrix-nginx-proxy[155068]: x.x.x.x - - [17/May/2022:12:38:06 +0000] "GET /_matrix/media/r0/preview_url?url=https%3A%2F%2Fmatrix.domain.tld%2Fhookshot%2Fwebhooks%2F647417c9-70e7-4283-a86a-42a5ba447ab5%253C%2Fcode%253E&ts=1652791080000 HTTP/1.0" 502 47 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:100.0) Gecko/20100101 Firefox/100.0" "10.10.10.16"

To Reproduce Steps to reproduce the behavior:

1. Install Matrix + Components according to https://github.com/spantaleev/matrix-docker-ansible-deploy/blob/master/docs/prerequisites.md (worked previously till 10 Days ago)
2. Create a Room
3. Invite Hookshot User and create a Webhook according to documentation
4. Send Data (e.g. via Postman) to the Webhook

Expected behavior Webhook should work as previously

Additional context Reinstalled the whole Server 3 times + new Git Pull + routing the Server directly without Firewall to the WAN. Using Debian 11 in a Proxmox VM with a Sophos XG as a Firewall.

Sadly, the Logs don’t give any more Information (like the Daemon Log of Docker etc.) but it worked fine as of around 10 Days ago when using the same Ansible Playbook.