Heredoc broken when using injected bash grammar with indentation

[cloud303-pdavis]

The base bash highlighting "breaks" if there is a space before the closing heredoc tag

thing=foobar

cat <<EOF >/tmp/foobar
thing = ${thing}
 EOF  # breaks with a space here

echo "done"

Now this is correct from the perspective of a regular bash script, but if the bash grammar is embedded within another grammar with a leading indent (like a block of code in a yaml document) it breaks the highlighting

mything:
  UserData: 
    Fn::Base64:|
      thing=foobar
    
      cat <<EOF >/tmp/foobar
      thing = ${thing}
      EOF

      echo "done"

I am using this to inject the grammar

; extends

(block_mapping_pair
  key: (flow_node) @_run
  (#any-of? @_run "UserData")
  value: (block_node
		   (block_mapping
			 (block_mapping_pair
			   key: (flow_node)
			   value: (block_node
						(block_scalar) @injection.content
						(#set! injection.language "bash"))))))

I'm not sure if there is a way even a way around this though.