aws_ecs_metrics source - invalid type: null, expected struct ContainerStats

[winadm87]

Good day.
Tried to configure vector to gather ECS task metrics but got an error:
ERROR source{component_kind="source" component_id=source_aws_ecs_metrics component_type=aws_ecs_metrics}: vector::internal_events::aws_ecs_metrics: Parsing error. endpoint=http://169.254.170.2/v3/f4275bb6-2577-45f4-8500-49c6f5fa28ad/task/stats error=Error("invalid type: null, expected struct ContainerStats", line: 1, column: 72) stage="processing" error_type="parser_failed" internal_log_rate_limit=true

Vector configuration:
sources: ... source_aws_ecs_metrics: type: aws_ecs_metrics scrape_interval_secs: 15 version: v4 ...

In a deployed vector container, I can observe environments
ECS_CONTAINER_METADATA_URI=http://169.254.170.2/v3/f4275bb6-2577-45f4-8500-49c6f5fa28ad ECS_CONTAINER_METADATA_URI_V4=http://169.254.170.2/v4/f4275bb6-2577-45f4-8500-49c6f5fa28ad

The versions:
EC2: AWS amz linux 2, amzn2-ami-ecs-hvm-2.0.20250102-x86_64-ebs
ECS agent: "Starting Amazon ECS Agent" version="1.89.2" commit="41d593c6"
Vector.dev: "timberio/vector:0.43.1-debian"

Questions:

1. If I have specify v4 in source - and vector can see env ECS_CONTAINER_METADATA_URI_V4 - why does it try to use v3 endpoint? In the doc it is specified that v4 in that case should be used
2. I can curl to http://169.254.170.2/v3/f4275bb6-2577-45f4-8500-49c6f5fa28ad/task/stats and get payload from ec2 instance itself and from any container in the ECS task. Unfortunately, I can't check if this endpoint is available from vector container. But if endpoint is available from other containers - I assume that it is available from vector container too. The question why it sees null instead of payload.