Currently, Render only triggers Preview Environments for pull requests where the target base branch is the Blueprint’s linked branch (usually main). With GitHub's introduction of native stacked pull requests, developers can now create linear chains of dependent PRs where a downstream feature branch targets an upstream feature branch instead of main (e.g., feature-B targeting feature-A). Because Render strictly checks for the linked branch on incoming PR webhooks, all intermediate and downstream stacked PRs are ignored, and no Preview Environments are deployed for them. Teams cannot easily preview, test or share progress on individual segments of a stacked PR chain. The only current workarounds are manually changing the PR target branch back and forth in GitHub to trick Render into building it, or maintaining complex custom GitHub Actions with Deploy Hooks. Please add support for triggering Preview Environments on PRs that target non-linked branches or introduce native awareness of GitHub’s stacked PR metadata.