[BUG] v5.1.4 error -> yaml: map merge requires map or sequence of maps as the value

[Elendiar]

Description

After updating docker desktop to latest get an error trying to compose up yaml file: line 1: yaml: map merge requires map or sequence of maps as the value

File starts with:

x-build-base: &build-base
  context: ..

...

***:
  build:
        <<: *build-base

I fix this downloading previous version (v5.1.2) of docker-compose.exe for windows from github and it works as intended, so issue is with new 5.1.4 version...

Steps To Reproduce

No response

Compose Version

Docker Environment

Anything else?

No response