Steps to reproduce (*)
Construct a package dependency graph for Magento 2.4.3 and 2.3.1-p1 based on the public repositories in https://github.com/magento
Expected result (*)
All required dependencies can be satisfied by inspecting the appropriate tags.
Actual result (*)
The magento/adobe-ims package source for 2.1.2 is not publicly available in this repository.
Maybe someone forgot to do a git push --tags?