Validation issue with {#with}

The following snippet validates properly with qute-ls but fails during quarkus build:

{#let title="WELCOME" }
	{title} 

	{#with title}
		{blank}
	{/}
	{{title}}
  {/let}

java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
        [error]: Build step io.quarkus.qute.deployment.QuteProcessor#processTemplateErrors threw an exception: io.quarkus.qute.TemplateException: Found template problems (2):
[1] Incorrect expression found: {blank}
        - Only type-safe expressions are allowed in the checked template defined via: org.acme.ItemResource$Templates.list(); an expression must be based on a checked template parameter [items], or bound via a param declaration, or the requirement must be relaxed via @CheckedTemplate(requireTypeSafeExpressions = false)
        - at ItemResource/list.qute.html:12

Another case:

{#each item in items}
  {#with item}
	{name}
  {/with}
{each}

No error in qute-ls but at build time you get:

[2] Incorrect expression found: {name}
        - Only type-safe expressions are allowed in the checked template defined via: org.acme.ItemResource$Templates.list(); an expression must be based on a checked template parameter [items], or bound via a param declaration, or the requirement must be relaxed via @CheckedTemplate(requireTypeSafeExpressions = false)

@mkouba how come those 2 cases are incorrect in Qute proper?