fix: missing serialisation when child tag has its own state

[vwong]

Description

#3183 introduced a regression whereby some client-only components were not serialised correctly. This fixes it.

Details

The static-content optimisation in getSectionRegisterReasons incorrectly skipped registering the section renderer when all of: downstreamReasons was specific (not true), the content section had no own serialize reasons, and neither did its parent section. This was too broad — it also fired when the downstream component had its own reactive state that caused it to unconditionally write input.content into its serialized scope, making the renderer unresolvable on the client.

The fix tightens the guard to only skip when downstreamReasons is param/input-driven (isReasonDynamic), which covers the purely iterative case from known-rest-attr-tag but not the case where the consumer's own state (e.g. <let/show>) forces the content reference into its scope regardless of what the parent passes.

Checklist:

• I have read the CONTRIBUTING document and have signed (or will sign) the CLA.
• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[changeset-bot]

🦋 Changeset detected

Latest commit: 2700582

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@marko/runtime-tags	Patch
marko	Patch

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⛔ Files ignored due to path filters (8)

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• packages/runtime-tags/src/__tests__/fixtures/static-content-conditional-consumer/__snapshots__/render.debug.md is excluded by !**/__snapshots__/** and included by **
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📒 Files selected for processing (5)

• .changeset/cozy-drinks-roll.md
• packages/runtime-tags/src/__tests__/fixtures/static-content-conditional-consumer/tags/consumer.marko
• packages/runtime-tags/src/__tests__/fixtures/static-content-conditional-consumer/template.marko
• packages/runtime-tags/src/__tests__/fixtures/static-content-conditional-consumer/test.ts
• packages/runtime-tags/src/translator/util/sections.ts

---

Walkthrough

This PR fixes content renderer registration when a downstream component has its own state. The core change modifies the condition in getSectionRegisterReasons from checking downstreamReasons !== true to using isReasonDynamic(downstreamReasons). A new test fixture validates the fix by defining a consumer component with a toggle button and conditional content placeholder that receives static content from a parent template, with test steps exercising the state transitions.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main fix: addressing missing serialization when a child tag has its own state, which matches the core change in sections.ts and the regression fix objective.
Description check	✅ Passed	The description is directly related to the changeset, explaining the regression from PR #3183, the root cause in getSectionRegisterReasons, and how the fix tightens the guard condition with isReasonDynamic.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.78%. Comparing base (70846fd) to head (2700582).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3198   +/-   ##
=======================================
  Coverage   92.78%   92.78%           
=======================================
  Files         372      372           
  Lines       47324    47324           
  Branches     3387     3387           
=======================================
  Hits        43911    43911           
  Misses       3380     3380           
  Partials       33       33           

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