Gitlab Pipeline: lftp runs into a timeout - gitlab

Question

I received a notification a few days ago from my gitlab runner about a failed pipeline.
The Pipeline was working normally and nothing got changed, which makes everything a bit harder to investigate.
The specific command which causes the timeout of 1 hour is the following:
lftp -e "set ftp:ssl-allow no; mirror -R dist/ ./; quit;" -u $USER_TEST,$PASSWORD_TEST $HOST_TEST
This was working fine. I tried to troubleshoot this problem. There are a plenty of reasons out there why the timeout happens. However none of it was solving my problem.
A short brief of what the git pipeline does:
building an angular app (the dist folder's size is about 750kB)
deploying it on a server using ftp credentials
I manually went through the pipeline steps, hoping to replicate the bug, but it was working fine.
.gitlab-ci.yml:
image: node:14.15.3-alpine
cache:
paths:
- node_modules/
stages:
- build
- deploy
#DEV Stage
build_stage_dev:
stage: build
only:
refs:
- develop
cache:
paths:
- dist/
script:
- npm install --legacy-peer-deps
- npm install -g #angular/cli#11.0.5
- ng build --build-optimizer
deploy_stage_dev:
stage: deploy
environment: develop
only:
refs:
- develop
script:
- apk update && apk add openssh-client && apk add sshpass
- export SSHPASS=$PASSWORD_DEV
#command to remove all files first
#- sshpass -e ssh -o stricthostkeychecking=no $USER_DEV#$HOST_DEV rm -r /var/www/app/*
- sshpass -e scp -o stricthostkeychecking=no -r dist/* $USER_DEV#$HOST_DEV:/var/www/app
#TEST Stage
build_stage_test:
stage: build
only:
refs:
- test
cache:
paths:
- dist/
script:
- npm install --legacy-peer-deps
- npm install -g #angular/cli#11.0.5
- ng build --build-optimizer
deploy_stage_test:
stage: deploy
environment: test
only:
refs:
- test
script:
- apk update && apk add lftp
- lftp -e "set ftp:ssl-allow no; mirror -R dist/ ./; quit;" -u $USER_TEST,$PASSWORD_TEST $HOST_TEST
The DEV Stage (deploying with the ssh) is working fine. Only the test stage throws an error after 1 hour.
This is the error I receive on Gitlab: ERROR: Job failed: execution took longer than 1h0m0s seconds
Maybe any of you have experienced the same? or did "lftp" got an update and I am running into an enndless job?
Also I checked whether files are getting updated at all, the answer is no. I thought it could be an issue with "quit". But appearently nothing is getting transferred at all.