Here's why:

Lines 84 to 96 in 613f6fa

    
           if ( 
        
               request 
        
               and request.args.get("_context") 
        
               and self.ds.config("template_debug") 
        
           ): 
        
               return Response.html( 
        
                   "<pre>{}</pre>".format( 
        
                       jinja2.escape(json.dumps(template_context, default=repr, indent=4)) 
        
                   ) 
        
               ) 
        
           return Response.html( 
        
               await self.ds.render_template(template, template_context, request=request) 
        
           )

It's bypassing the .ds.render_template() call - and that's where the plugin hook is executed:

datasette/datasette/app.py

Lines 520 to 564 in 613f6fa

    
           async def render_template( 
        
               self, templates, context=None, request=None, view_name=None 
        
           ): 
        
               context = context or {} 
        
               if isinstance(templates, Template): 
        
                   template = templates 
        
                   select_templates = [] 
        
               else: 
        
                   if isinstance(templates, str): 
        
                       templates = [templates] 
        
                   template = self.jinja_env.select_template(templates) 
        
                   select_templates = [ 
        
                       "{}{}".format( 
        
                           "*" if template_name == template.name else "", template_name 
        
                       ) 
        
                       for template_name in templates 
        
                   ] 
        
               body_scripts = [] 
        
               # pylint: disable=no-member 
        
               for script in pm.hook.extra_body_script( 
        
                   template=template.name, 
        
                   database=context.get("database"), 
        
                   table=context.get("table"), 
        
                   view_name=view_name, 
        
                   datasette=self, 
        
               ): 
        
                   body_scripts.append(Markup(script)) 
        
               extra_template_vars = {} 
        
               # pylint: disable=no-member 
        
               for extra_vars in pm.hook.extra_template_vars( 
        
                   template=template.name, 
        
                   database=context.get("database"), 
        
                   table=context.get("table"), 
        
                   view_name=view_name, 
        
                   request=request, 
        
                   datasette=self, 
        
               ): 
        
                   if callable(extra_vars): 
        
                       extra_vars = extra_vars() 
        
                   if asyncio.iscoroutine(extra_vars): 
        
                       extra_vars = await extra_vars 
        
                   assert isinstance(extra_vars, dict), "extra_vars is of type {}".format( 
        
                       type(extra_vars) 
        
                   )

	if (
	request
	and request.args.get("_context")
	and self.ds.config("template_debug")
	):
	return Response.html(
	"<pre>{}</pre>".format(
	jinja2.escape(json.dumps(template_context, default=repr, indent=4))
	)
	)
	return Response.html(
	await self.ds.render_template(template, template_context, request=request)
	)

	async def render_template(
	self, templates, context=None, request=None, view_name=None
	):
	context = context or {}
	if isinstance(templates, Template):
	template = templates
	select_templates = []
	else:
	if isinstance(templates, str):
	templates = [templates]
	template = self.jinja_env.select_template(templates)
	select_templates = [
	"{}{}".format(
	"*" if template_name == template.name else "", template_name
	)
	for template_name in templates
	]
	body_scripts = []
	# pylint: disable=no-member
	for script in pm.hook.extra_body_script(
	template=template.name,
	database=context.get("database"),
	table=context.get("table"),
	view_name=view_name,
	datasette=self,
	):
	body_scripts.append(Markup(script))

	extra_template_vars = {}
	# pylint: disable=no-member
	for extra_vars in pm.hook.extra_template_vars(
	template=template.name,
	database=context.get("database"),
	table=context.get("table"),
	view_name=view_name,
	request=request,
	datasette=self,
	):
	if callable(extra_vars):
	extra_vars = extra_vars()
	if asyncio.iscoroutine(extra_vars):
	extra_vars = await extra_vars
	assert isinstance(extra_vars, dict), "extra_vars is of type {}".format(
	type(extra_vars)
	)

Uh oh!

Variables from extra_template_vars() not exposed in _context=1 #693

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