argocd-image-updater: Update does not seem to happen

I have a project with a newly published image. I can see the argo-image-updater registering the new arrival, and triggering an update. The update does not however go through. Manually changing the app manifest in Argo does translate through to k8s though. So the connections

Argo-image-updater -> Repository and Argo -> k8s

do work, it seems to be a problem with the connection

Argo-image-updater -> Argo.

Debug steps I tried updating manually (editing the live manifest in the Argo UI), that went swimmingly (all pods deployed correctly). I tried assigning full admin privileges to the argo-image-updater user in Argo, that did not change anything. I restarted all pods in various configurations.

Logs

oc logs argocd-image-updater-<HASH>

time="2020-09-03T11:32:00Z" level=info msg="Processing results: applications=1 images_considered=1 images_updated=1 errors=0"
time="2020-09-03T11:34:00Z" level=debug msg="Starting image update process"
time="2020-09-03T11:34:00Z" level=debug msg="Considering 1 applications with annotations for update"
time="2020-09-03T11:34:00Z" level=debug msg="Processing application $APPLICATION"
time="2020-09-03T11:34:00Z" level=debug msg="Considering this image for update" application=$IMAGE image_name=$REPOSITORY/$IMAGE image_tag=2.1.0-dev.6 registry=$REGISTRY
time="2020-09-03T11:34:00Z" level=debug msg="Using version constraint '>=2.1.0-0' when looking for a new tag" application=$APPLICATION image_name=$REPOSITORY/$IMAGE image_tag=2.1.0-dev.6 registry=$REGISTRY
time="2020-09-03T11:34:00Z" level=debug msg="found 9 from 9 tags eligible for consideration" image="$REGISTRY/$REPOSITORY/$IMAGE:2.1.0-dev.6"
time="2020-09-03T11:34:00Z" level=info msg="Upgrading image to $REGISTRY/$REPOSITORY/$IMAGE:2.1.0-dev.102" application=$APPLICATION image_name=$REPOSITORY/$IMAGE image_tag=2.1.0-dev.6 registry=$REGISTRY
time="2020-09-03T11:34:00Z" level=debug msg="target parameters: image-spec= image-name=, image-tag=" application=$APPLICATION image=$REGISTRY/$REPOSITORY/$IMAGE
time="2020-09-03T11:34:02Z" level=info msg="Successfully updated image '$REGISTRY/$REPOSITORY/$IMAGE:2.1.0-dev.6' to '$REGISTRY/$REPOSITORY/$IMAGE:2.1.0-dev.102'" application=$APPLICATION image_name=$REPOSITORY/$IMAGE image_tag=2.1.0-dev.6 registry=$REGISTRY
time="2020-09-03T11:34:02Z" level=info msg="Processing results: applications=1 images_considered=1 images_updated=1 errors=0"

I believe the following of those lines hints at a problem: time="2020-09-03T11:34:00Z" level=debug msg="target parameters: image-spec= image-name=, image-tag=" application=$APPLICATION image=$REGISTRY/$REPOSITORY/$IMAGE

oc logs argocd-server-<HASH>

time="2020-09-03T11:48:14Z" level=info msg="received unary call /application.ApplicationService/UpdateSpec" grpc.method=UpdateSpec grpc.request.claims="{\"iat\":1597138354,\"iss\":\"argocd\",\"jti\":\"image-updater\",\"nbf\":1597138354,\"sub\":\"image-updater\"}" grpc.request.content="name:\"$APPLICATIONt\" spec:<source:<repoURL:\"$HELM_SOURCE_ENDS_IN_.git\" path:\"$HELM_CHART\" targetRevision:\"HEAD\" helm:<releaseName:\"\" values:\"\" > chart:\"\" > destination:<server:\"https://kubernetes.default.svc\" namespace:\"$APPLICATION\" > project:\"$ARGO_PROJECT\" syncPolicy:<automated:<prune:false selfHeal:false > > > " grpc.service=application.ApplicationService grpc.start_time="2020-09-03T11:48:14Z" span.kind=server system=grpc
time="2020-09-03T11:48:15Z" level=info msg="image-updater updated application spec" application= $APPLICATIONdest-namespace=$APPLICATION dest-server="https://kubernetes.default.svc" reason=ResourceUpdated type=Normal
time="2020-09-03T11:48:15Z" level=info msg="finished unary call with code OK" grpc.code=OK grpc.method=UpdateSpec grpc.service=application.ApplicationService grpc.start_time="2020-09-03T11:48:14Z" grpc.time_ms=1171.407 span.kind=server system=grpc

Any ideas?