Having troubles with tigris bucket for a few different url_prefixes

I’m having issues serving various static assets (based on the url_prefix) from a single Tigris bucket.

When I define only one tigris/storage rule in the toml file, the assets are served from the Tigris bucket.

primary_region = "lhr"

[build]

[http_service]
  internal_port = 3000
  force_https = true
  auto_stop_machines = "stop"
  auto_start_machines = true
  min_machines_running = 0
  processes = ["app"]

[[statics]]
  guest_path = "/client-assets/assets"
  url_prefix = "/assets"
  tigris_bucket = "my-bucket"

[[vm]]
  memory = "1gb"
  cpu_kind = "shared"
  cpus = 1

primary_region = "lhr"

[build]

[http_service]
  internal_port = 3000
  force_https = true
  auto_stop_machines = "stop"
  auto_start_machines = true
  min_machines_running = 0
  processes = ["app"]

[[statics]]
  guest_path = "/client-assets/assets"
  url_prefix = "/assets"
  tigris_bucket = "my-bucket"

[[vm]]
  memory = "1gb"
  cpu_kind = "shared"
  cpus = 1

But when I add an additional Tigris rule, only the second rule takes effect. For example, with this toml:

primary_region = "lhr"

[build]

[http_service]
  internal_port = 3000
  force_https = true
  auto_stop_machines = "stop"
  auto_start_machines = true
  min_machines_running = 0
  processes = ["app"]

[[statics]]
  guest_path = "/client-assets/assets"
  url_prefix = "/assets"
  tigris_bucket = "my-bucket"

[[statics]]
  guest_path = "/client-assets/brand"
  url_prefix = "/brand"
  tigris_bucket = "my-bucket"

[[vm]]
  memory = "1gb"
  cpu_kind = "shared"
  cpus = 1

primary_region = "lhr"

[build]

[http_service]
  internal_port = 3000
  force_https = true
  auto_stop_machines = "stop"
  auto_start_machines = true
  min_machines_running = 0
  processes = ["app"]

[[statics]]
  guest_path = "/client-assets/assets"
  url_prefix = "/assets"
  tigris_bucket = "my-bucket"

[[statics]]
  guest_path = "/client-assets/brand"
  url_prefix = "/brand"
  tigris_bucket = "my-bucket"

[[vm]]
  memory = "1gb"
  cpu_kind = "shared"
  cpus = 1

Files from the brand folder are served from the Tigris bucket, while those from assets are not.

Am I doing something wrong here?